The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE
OMB APPROVAL
OMB Number: 3235-0006
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COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8
VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY
NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE
AAR Corp COM 000361105 7,060 217,170 SH   SOLE   217,170 0 0
Abbott Laboratories COM 002824100 240,671 3,010,645 SH   SOLE   2,296,092 0 714,553
Abbvie Inc COM 00287Y109 6,818 84,596 SH   SOLE   12,155 0 72,441
Accenture PLC Cl A COM G1151C101 210 1,191 SH   SOLE   0 0 1,191
Actuant Corp COM 00508X203 8,786 360,508 SH   SOLE   360,508 0 0
Adobe Inc. COM 00724F101 553 2,075 SH   SOLE   375 0 1,700
ALLETE, Inc. COM 018522300 6,152 74,818 SH   SOLE   38,940 0 35,878
Alliant Energy Corp. COM 018802108 341 7,228 SH   SOLE   0 0 7,228
Alphabet Inc Class A COM 02079K305 1,683 1,430 SH   SOLE   777 0 653
Alphabet Inc Class C COM 02079K107 325,368 277,308 SH   SOLE   234,725 0 42,583
Altria Group Inc COM 02209S103 246 4,288 SH   SOLE   563 0 3,725
Amazon Com Inc COM 023135106 1,097 616 SH   SOLE   121 0 495
American Express COM 025816109 151,745 1,388,333 SH   SOLE   1,103,123 0 285,210
American Tower Cl A COM 03027X100 659 3,345 SH   SOLE   200 0 3,145
Ameriprise Financial COM 03076C106 299 2,331 SH   SOLE   90 0 2,241
Ametek Inc. COM 031100100 224 2,700 SH   SOLE   2,700 0 0
Amgen COM 031162100 1,725 9,080 SH   SOLE   1,500 0 7,580
Apogee Enterprises, Inc COM 037598109 14,836 395,730 SH   SOLE   395,630 0 100
Apple Computer COM 037833100 6,297 33,151 SH   SOLE   12,381 0 20,770
Applied Materials Inc COM 038222105 331 8,352 SH   SOLE   875 0 7,477
Assoc Banc Corp COM 045487105 55,640 2,606,076 SH   SOLE   2,255,185 0 350,891
AT&T COM 00206R102 1,281 40,857 SH   SOLE   9,063 0 31,794
Automatic Data Proc COM 053015103 807 5,052 SH   SOLE   3,952 0 1,100
Badger Meter Inc COM 056525108 47,584 855,204 SH   SOLE   589,373 0 265,831
Bank of America Corp COM 060505104 413 14,955 SH   SOLE   4,390 0 10,565
Baxter International COM 071813109 54,055 664,797 SH   SOLE   411,740 0 253,057
Becton Dickinson & Co COM 075887109 790 3,165 SH   SOLE   1,567 0 1,598
Bemis COM 081437105 112,439 2,026,656 SH   SOLE   1,481,039 0 545,617
Berkshire Hathaway COM 084670108 3,313 11 SH   SOLE   1 0 10
Berkshire Hathaway B COM 084670702 4,452 22,163 SH   SOLE   1,883 0 20,280
Bio-Techne Corp COM 09073M104 229,077 1,153,750 SH   SOLE   926,217 0 227,533
Biogen Inc. COM 09062X103 242 1,025 SH   SOLE   0 0 1,025
Black Hills Corp COM 092113109 12,603 170,150 SH   SOLE   170,150 0 0
Boeing COM 097023105 1,594 4,180 SH   SOLE   1,965 0 2,215
BP PLC COM 055622104 1,062 24,302 SH   SOLE   8,062 0 16,240
Bristol-Myers Squibb COM 110122108 11,897 249,356 SH   SOLE   162,141 0 87,215
Cabot Microelectronics Corp COM 12709P103 3,359 30,000 SH   SOLE   30,000 0 0
Calyxt Inc COM 13173L107 3,156 179,431 SH   SOLE   179,431 0 0
Cardiovascular Sys Inc COM 141619106 3,688 95,404 SH   SOLE   95,404 0 0
Carrizo Oil & Gas, Inc. COM 144577103 7,040 564,560 SH   SOLE   564,560 0 0
Casey's General Stores COM 147528103 10,894 84,600 SH   SOLE   84,600 0 0
Catalent, Inc. COM 148806102 12,679 312,358 SH   SOLE   311,755 0 603
Caterpillar COM 149123101 954 7,040 SH   SOLE   100 0 6,940
Celgene Corp COM 151020104 271 2,870 SH   SOLE   0 0 2,870
Centerpoint Energy Inc COM 15189T107 209 6,798 SH   SOLE   0 0 6,798
CH Robinson Worldwide COM 12541W209 166,717 1,916,507 SH   SOLE   1,531,311 0 385,196
Charles Schwab COM 808513105 46,294 1,082,637 SH   SOLE   831,296 0 251,341
Chevron Corp COM 166764100 31,172 253,064 SH   SOLE   112,347 0 140,717
Cisco COM 17275R102 2,008 37,184 SH   SOLE   9,621 0 27,563
Clorox COM 189054109 243 1,513 SH   SOLE   1,513 0 0
Coca-Cola COM 191216100 1,356 28,942 SH   SOLE   9,500 0 19,442
Colgate-Palmolive COM 194162103 608 8,876 SH   SOLE   2,100 0 6,776
Comcast New Cl A COM 20030N101 331 8,285 SH   SOLE   2,574 0 5,711
ConocoPhillips COM 20825C104 7,272 108,954 SH   SOLE   19,038 0 89,916
Core Laboratories NV COM N22717107 22,947 332,899 SH   SOLE   278,187 0 54,712
CoreSite Realty Corp COM 21870Q105 115,893 1,082,907 SH   SOLE   932,223 0 150,684
Corning COM 219350105 69,791 2,108,503 SH   SOLE   1,714,869 0 393,634
Costco Wholesale COM 22160K105 836 3,453 SH   SOLE   800 0 2,653
Cray Inc COM 225223304 14,474 555,618 SH   SOLE   332,638 0 222,980
CSX Corporation COM 126408103 595 7,950 SH   SOLE   0 0 7,950
Cullen Frost Bankers COM 229899109 18,101 186,475 SH   SOLE   152,905 0 33,570
CyberOptics Corp COM 232517102 3,718 217,444 SH   SOLE   217,444 0 0
Deere & Co. COM 244199105 230 1,442 SH   SOLE   112 0 1,330
Deluxe Corp COM 248019101 2,172 49,676 SH   SOLE   325 0 49,351
Digi Int'l Inc. COM 253798102 3,183 251,185 SH   SOLE   251,185 0 0
Disney COM 254687106 216,067 1,946,024 SH   SOLE   1,587,565 0 358,459
Dominion Energy, Inc. COM 25746U109 355 4,632 SH   SOLE   1,000 0 3,632
Donaldson COM 257651109 252,683 5,047,602 SH   SOLE   3,964,812 0 1,082,790
DowDupont Inc COM 26078J100 511 9,579 SH   SOLE   1,982 0 7,597
Ecolab Inc COM 278865100 357,662 2,025,955 SH   SOLE   1,526,200 0 499,755
Edwards Lifesciences COM 28176E108 253 1,320 SH   SOLE   200 0 1,120
Elanco Animal Health Inc. COM 28414H103 10,395 324,144 SH   SOLE   214,726 0 109,417
EMC Insurance Group COM 268664109 3,577 112,216 SH   SOLE   112,216 0 0
Emerson Electric COM 291011104 28,420 415,075 SH   SOLE   166,292 0 248,783
Enterprise Prod Ptnrs LP COM 293792107 268 9,200 SH   SOLE   8,600 0 600
Exelon Corp COM 30161N101 573 11,428 SH   SOLE   0 0 11,428
Exxon Mobil COM 30231G102 36,195 447,953 SH   SOLE   168,341 0 279,612
Facebook Inc Class A COM 30303M102 217 1,300 SH   SOLE   1,234 0 66
Fastenal Co. COM 311900104 180,061 2,799,884 SH   SOLE   2,204,101 0 595,783
FireEye, Inc. COM 31816Q101 3,094 184,295 SH   SOLE   184,295 0 0
Fiserv COM 337738108 179,810 2,036,817 SH   SOLE   1,607,011 0 429,806
Fleetcor Technologies Inc COM 339041105 247 1,000 SH   SOLE   0 0 1,000
Garrett Motion Inc. COM 366505105 208 14,154 SH   SOLE   2,826 0 11,328
Generac Hldgs COM 368736104 34,777 678,832 SH   SOLE   599,893 0 78,939
General Electric COM 369604103 1,506 150,791 SH   SOLE   24,421 0 126,370
General Mills COM 370334104 140,641 2,717,696 SH   SOLE   1,960,603 0 757,093
Gentherm Inc COM 37253A103 19,280 523,065 SH   SOLE   479,678 0 43,387
Genuine Parts COM 372460105 218 1,950 SH   SOLE   1,700 0 250
Glacier Bancorp Inc COM 37637Q105 11,715 292,375 SH   SOLE   292,005 0 370
Graco Inc COM 384109104 261,523 5,281,152 SH   SOLE   3,897,185 0 1,383,968
Great Western Bancorp Inc. COM 391416104 69,076 2,186,656 SH   SOLE   1,899,865 0 286,791
Hawkins Chemical COM 420261109 3,633 98,637 SH   SOLE   92,137 0 6,500
HB Fuller COM 359694106 131,434 2,702,169 SH   SOLE   2,278,488 0 423,681
Heico Corp COM 422806109 222 2,345 SH   SOLE   1,845 0 500
Hershey COM 427866108 12,023 104,703 SH   SOLE   91,790 0 12,913
Home Depot COM 437076102 59,918 312,250 SH   SOLE   185,942 0 126,308
Honeywell Inc COM 438516106 254,787 1,603,241 SH   SOLE   1,163,881 0 439,360
Hormel COM 440452100 259,015 5,786,747 SH   SOLE   4,556,535 0 1,230,212
Hub Group Inc Cl A COM 443320106 11,179 273,665 SH   SOLE   273,665 0 0
IBM COM 459200101 6,011 42,599 SH   SOLE   27,461 0 15,138
IDEXX Laboratories, Inc COM 45168D104 760 3,398 SH   SOLE   400 0 2,998
Illinois Tool Works Inc COM 452308109 416 2,899 SH   SOLE   1,450 0 1,449
Inspire Medical Systems Inc COM 457730109 8,899 156,730 SH   SOLE   155,830 0 900
Intel COM 458140100 21,067 392,312 SH   SOLE   108,320 0 283,992
Intl Flavors/Fragr COM 459506101 318 2,466 SH   SOLE   2,466 0 0
Intricon Corp Com COM 46121H109 5,593 222,998 SH   SOLE   222,998 0 0
IPG Photonics Corp COM 44980X109 228 1,500 SH   SOLE   0 0 1,500
J.P. Morgan Chase & Co COM 46625H100 25,236 249,289 SH   SOLE   156,888 0 92,401
Johnson & Johnson COM 478160104 290,194 2,075,930 SH   SOLE   1,598,086 0 477,844
Kellogg COM 487836108 244 4,250 SH   SOLE   1,700 0 2,550
Kimberly-Clark COM 494368103 16,384 132,239 SH   SOLE   49,816 0 82,423
Lilly (Eli) COM 532457108 89,319 688,338 SH   SOLE   467,116 0 221,222
Littelfuse Inc. COM 537008104 69,581 381,308 SH   SOLE   324,782 0 56,526
Lowes Companies Inc COM 548661107 807 7,369 SH   SOLE   2,751 0 4,618
Marcus Corp. COM 566330106 8,116 202,658 SH   SOLE   202,658 0 0
MasterCard Inc COM 57636Q104 635 2,695 SH   SOLE   200 0 2,495
McCormick & Co COM 579780206 203 1,350 SH   SOLE   600 0 750
McDonald's Corp COM 580135101 2,812 14,806 SH   SOLE   10,985 0 3,821
MDU Resources Group COM 552690109 1,785 69,093 SH   SOLE   16,708 0 52,385
Medtronic COM G5960L103 278,824 3,061,304 SH   SOLE   2,366,718 0 694,586
Merck & Co Inc COM 58933Y105 6,898 82,943 SH   SOLE   17,686 0 65,257
MGP Ingredients Inc COM 55303J106 5,107 66,200 SH   SOLE   66,200 0 0
Microsoft COM 594918104 193,817 1,643,349 SH   SOLE   1,369,492 0 273,857
MMM Co. COM 88579Y101 361,441 1,739,535 SH   SOLE   1,248,487 0 491,048
Mondelez Intl Cl A COM 609207105 218 4,364 SH   SOLE   3,085 0 1,279
Motorola Solutions Inc COM 620076307 24,918 177,451 SH   SOLE   167,457 0 9,994
MTS Systems COM 553777103 1,771 32,515 SH   SOLE   10,300 0 22,215
Nestle S A Reg B ADR COM 641069406 234 2,450 SH   SOLE   1,550 0 900
NextEra Energy, Inc. COM 65339F101 320 1,656 SH   SOLE   167 0 1,489
Nike COM 654106103 371 4,400 SH   SOLE   1,450 0 2,950
Norfolk Southern Corp COM 655844108 815 4,360 SH   SOLE   0 0 4,360
Northrop Grumman Corp COM 666807102 201 747 SH   SOLE   500 0 247
Novartis COM 66987V109 279 2,900 SH   SOLE   500 0 2,400
NVE Corp COM 629445206 40,654 415,298 SH   SOLE   355,113 0 60,185
nVent Electric PLC COM G6700G107 58,144 2,155,072 SH   SOLE   1,614,160 0 540,912
NW Biotherapeutics COM 66737P600 3 12,500 SH   SOLE   0 0 12,500
Oasis Petroleum Inc COM 674215108 4,837 800,865 SH   SOLE   800,865 0 0
Old Natl Bancorp Ind Com COM 680033107 81,149 4,948,112 SH   SOLE   4,435,672 0 512,440
Oracle Sys COM 68389X105 1,657 30,849 SH   SOLE   747 0 30,102
Oshkosh Corp COM 688239201 13,839 184,200 SH   SOLE   184,200 0 0
Patterson Companies COM 703395103 13,105 599,765 SH   SOLE   390,397 0 209,368
Paychex COM 704326107 242 3,019 SH   SOLE   1,642 0 1,377
Pentair PLC COM G7S00T104 73,251 1,645,709 SH   SOLE   1,119,957 0 525,752
PepsiCo Inc COM 713448108 1,768 14,427 SH   SOLE   5,099 0 9,328
Pfizer Inc COM 717081103 120,084 2,827,510 SH   SOLE   2,094,858 0 732,652
Philip Morris Intl Inc COM 718172109 586 6,635 SH   SOLE   898 0 5,737
Phillips 66 COM 718546104 2,057 21,611 SH   SOLE   5,906 0 15,705
Physicians Realty Tr COM 71943U104 9,309 494,895 SH   SOLE   475,595 0 19,300
Premier Inc Cl A COM 74051N102 9,516 275,909 SH   SOLE   275,909 0 0
Principal Financial COM 74251V102 144,081 2,870,717 SH   SOLE   2,329,956 0 540,761
Procter & Gamble COM 742718109 27,491 264,208 SH   SOLE   70,902 0 193,306
Proto Labs COM 743713109 24,516 233,176 SH   SOLE   181,519 0 51,657
PureCycle Corp COM 746228303 117 11,855 SH   SOLE   0 0 11,855
QCR Holdings COM 74727A104 4,003 118,000 SH   SOLE   118,000 0 0
Qualcomm, Inc. COM 747525103 71,196 1,248,392 SH   SOLE   1,067,817 0 180,575
Raven Industries Inc COM 754212108 8,993 234,371 SH   SOLE   233,871 0 500
Raytheon Co COM 755111507 250 1,375 SH   SOLE   0 0 1,375
Resideo Technologies COM 76118Y104 1,074 55,696 SH   SOLE   32,823 0 22,873
Roche Hldg Ltd ADR COM 771195104 177,895 5,172,873 SH   SOLE   4,440,878 0 731,995
Royal Dutch Shell Spons ADR A COM 780259206 319 5,095 SH   SOLE   400 0 4,695
Schlumberger COM 806857108 94,196 2,161,947 SH   SOLE   1,745,645 0 416,302
Sherwin Williams Co COM 824348106 22,567 52,394 SH   SOLE   43,360 0 9,034
Snap-On Inc. COM 833034101 42,172 269,435 SH   SOLE   191,567 0 77,868
Southern Co. COM 842587107 228 4,417 SH   SOLE   1,659 0 2,758
Starbucks Corp COM 855244109 727 9,775 SH   SOLE   9,645 0 130
Stratasys Ltd COM M85548101 202 8,500 SH   SOLE   1,800 0 6,700
Sysco COM 871829107 352 5,272 SH   SOLE   2,872 0 2,400
Target COM 87612E106 72,151 898,962 SH   SOLE   542,137 0 356,824
TCF Financial COM 872275102 744 35,976 SH   SOLE   16,844 0 19,132
Tennant Company COM 880345103 81,120 1,306,485 SH   SOLE   1,130,268 0 176,217
Thermo Fisher Scientific COM 883556102 564 2,060 SH   SOLE   600 0 1,460
Tile Shop Inc COM 88677Q109 5,330 941,765 SH   SOLE   941,765 0 0
Toro COM 891092108 194,253 2,821,807 SH   SOLE   2,208,794 0 613,013
Travelers Cos Inc COM 89417E109 32,703 238,430 SH   SOLE   91,854 0 146,576
Union Pacific COM 907818108 1,469 8,786 SH   SOLE   1,900 0 6,886
United Bankshares Inc. COM 909907107 4,724 130,359 SH   SOLE   130,359 0 0
United Fire Group COM 910340108 6,532 149,432 SH   SOLE   149,432 0 0
United Health Group COM 91324P102 131,090 530,171 SH   SOLE   448,508 0 81,663
United Parcel Service COM 911312106 102,120 913,903 SH   SOLE   656,512 0 257,391
United Technologies COM 913017109 1,645 12,759 SH   SOLE   3,586 0 9,173
US Bancorp COM 902973304 318,288 6,604,860 SH   SOLE   5,281,746 0 1,323,114
Verizon Comm COM 92343V104 7,039 119,044 SH   SOLE   15,182 0 103,862
Visa, Inc COM 92826C839 104,368 668,210 SH   SOLE   551,201 0 117,009
Walgreen Boots Alliance COM 931427108 630 9,950 SH   SOLE   1,700 0 8,250
Walmart Inc COM 931142103 451 4,621 SH   SOLE   1,700 0 2,921
WEC Energy Group COM 92939U106 583 7,369 SH   SOLE   0 0 7,369
Wells Fargo & Co COM 949746101 101,479 2,100,151 SH   SOLE   1,482,932 0 617,219
Westamerica Bancorporation COM 957090103 331 5,359 SH   SOLE   0 0 5,359
Western Union COM 959802109 2,143 116,005 SH   SOLE   16,000 0 100,005
Weyerhaeuser COM 962166104 460 17,458 SH   SOLE   5,299 0 12,159
Wintrust Finan Corp COM 97650W108 14,293 212,285 SH   SOLE   212,285 0 0
Workiva Inc COM 98139A105 7,038 138,813 SH   SOLE   138,813 0 0
Xcel Energy Inc. COM 98389B100 13,976 248,643 SH   SOLE   107,718 0 140,925
Zimmer Biomet Holdings COM 98956P102 131,464 1,029,477 SH   SOLE   810,829 0 218,648
Zoetis Inc. COM 98978V103 387 3,840 SH   SOLE   1,900 0 1,940
AMEX Technology SPDR ETF 81369Y803 204 2,752 SH   SOLE   198 0 2,554
iShares Core S&P 500 ETF ETF 464287200 1,270 4,464 SH   SOLE   0 0 4,464
iShares Core S&P Midcap ETF ETF 464287507 399 2,105 SH   SOLE   0 0 2,105
iShares MSCI EAFE Fd ETF 464287465 405 6,239 SH   SOLE   0 0 6,239
iShares Russell 1000 Growth ETF 464287614 991 6,545 SH   SOLE   0 0 6,545
iShares Russell 1000 Value ETF 464287598 503 4,075 SH   SOLE   75 0 4,000
iShares Russell 2000 ETF ETF 464287655 532 3,475 SH   SOLE   155 0 3,320
iShares Russell Midcap ETF ETF 464287499 694 12,860 SH   SOLE   0 0 12,860
iShares S&P Smallcap ETF 464287887 295 1,655 SH   SOLE   0 0 1,655
iShares Select Div ETF 464287168 585 5,959 SH   SOLE   0 0 5,959
Schwab Intl Eq ETF ETF 808524805 1,571 50,190 SH   SOLE   0 0 50,190
Schwab US Broad Mkt ETF ETF 808524102 3,087 45,370 SH   SOLE   11,560 0 33,810
SPDR S&P 500 ETF Trust ETF 78462F103 6,400 22,657 SH   SOLE   11,759 0 10,898
Vanguard Dividend App ETF ETF 921908844 351 3,204 SH   SOLE   959 0 2,245
Eaton Vance Muni Bond COM 27827X101 174 14,025 SH   SOLE   14,025 0 0
Nuveen MN Qual Mun Income Fd COM 670734102 496 37,002 SH   SOLE   5,802 0 31,200
Nuveen Quality Muncp Income Fd COM 67066V101 273 20,144 SH   SOLE   15,992 0 4,152