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
Estimated average burden
hours per response: 23.8
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
Abbott Laboratories COM 002824100 14,323 318,918 SH   SOLE   158,610 0 160,308
Abbvie Inc COM 00287Y109 15,806 266,811 SH   SOLE   99,920 0 166,891
Accenture PLC Cl A COM G1151C101 327 3,132 SH   SOLE   0 0 3,132
Actuant Corp COM 00508X203 5,207 217,340 SH   SOLE   217,340 0 0
Adobe Systems COM 00724F101 204 2,175 SH   SOLE   0 0 2,175
Agree Realty Corp COM 008492100 7,120 209,469 SH   SOLE   209,469 0 0
ALLETE, Inc. COM 018522300 13,014 256,027 SH   SOLE   182,162 0 73,865
Alliant Energy Corp. COM 018802108 273 4,364 SH   SOLE   0 0 4,364
Alnylam Pharm Inc COM 02043Q107 217 2,300 SH   SOLE   0 0 2,300
Alphabet Inc Cl A COM 02079K305 454 583 SH   SOLE   6 0 577
Alphabet Inc Cl C COM 02079K107 383 505 SH   SOLE   10 0 495
Altria Group Inc COM 02209S103 550 9,448 SH   SOLE   0 0 9,448
Amazon Com Inc COM 023135106 577 853 SH   SOLE   0 0 853
American Express COM 025816109 56,806 816,759 SH   SOLE   621,575 0 195,184
Ameriprise Financial COM 03076C106 254 2,391 SH   SOLE   0 0 2,391
Amgen COM 031162100 1,800 11,091 SH   SOLE   0 0 11,091
Apogee Enterprises, Inc COM 037598109 5,874 135,000 SH   SOLE   135,000 0 0
Apple Computer COM 037833100 1,653 15,708 SH   SOLE   95 0 15,613
Assoc Banc Corp COM 045487105 61,360 3,272,529 SH   SOLE   2,767,260 0 505,269
AT&T COM 00206R102 1,319 38,323 SH   SOLE   0 0 38,323
Autoliv Inc COM 052800109 332 2,664 SH   SOLE   0 0 2,664
Automatic Data Proc COM 053015103 381 4,502 SH   SOLE   0 0 4,502
Badger Meter Inc COM 056525108 68,886 1,175,731 SH   SOLE   888,938 0 286,793
Bank Mutual Corp. COM 063750103 2,222 284,813 SH   SOLE   284,813 0 0
Bank of America Corp COM 060505104 231 13,739 SH   SOLE   0 0 13,739
Bank of Montreal COM 063671101 230 4,074 SH   SOLE   0 0 4,074
Baxalta Inc COM 07177M103 70,631 1,809,670 SH   SOLE   1,274,752 0 534,918
Baxter International COM 071813109 85,942 2,252,752 SH   SOLE   1,727,818 0 524,934
Becton Dickinson COM 075887109 799 5,184 SH   SOLE   0 0 5,184
Bemis COM 081437105 207,064 4,633,346 SH   SOLE   3,558,424 0 1,074,922
Berkshire Hathaway COM 084670108 593 3 SH   SOLE   0 0 3
Berkshire Hathaway B COM 084670702 1,821 13,788 SH   SOLE   60 0 13,728
Bio-Techne Corp COM 09073M104 117,620 1,306,885 SH   SOLE   1,004,190 0 302,695
Biogen Inc. COM 09062X103 335 1,095 SH   SOLE   0 0 1,095
Boeing COM 097023105 398 2,752 SH   SOLE   72 0 2,680
BP PLC COM 055622104 3,158 101,037 SH   SOLE   14,402 0 86,635
Bristol-Myers Squibb COM 110122108 19,747 287,063 SH   SOLE   148,278 0 138,785
Buffalo Wild Wings Inc COM 119848109 4,331 27,130 SH   SOLE   27,130 0 0
C H Robinson Worldwide COM 12541W209 125,122 2,017,454 SH   SOLE   1,575,025 0 442,429
Cardinal Financial Corp COM 14149F109 5,845 256,906 SH   SOLE   256,906 0 0
Cardiovascular Sys Inc COM 141619106 3,723 246,202 SH   SOLE   243,002 0 3,200
Casey's General Stores COM 147528103 5,597 46,470 SH   SOLE   46,470 0 0
Caterpillar COM 149123101 342 5,032 SH   SOLE   0 0 5,032
Celgene Corp COM 151020104 321 2,681 SH   SOLE   0 0 2,681
Charles Schwab COM 808513105 3,203 97,273 SH   SOLE   24,890 0 72,383
Chevron Corp COM 166764100 32,464 360,874 SH   SOLE   135,446 0 225,428
Cigna Corp COM 125509109 687 4,695 SH   SOLE   0 0 4,695
Cisco COM 17275R102 712 26,231 SH   SOLE   350 0 25,881
Cliffs Natural Resources COM 18683K101 24 15,000 SH   SOLE   0 0 15,000
Clorox COM 189054109 248 1,957 SH   SOLE   1,700 0 257
Coca-Cola COM 191216100 928 21,609 SH   SOLE   0 0 21,609
Colgate-Palmolive COM 194162103 700 10,503 SH   SOLE   0 0 10,503
Comcast New Cl A COM 20030N101 243 4,299 SH   SOLE   0 0 4,299
ConocoPhillips COM 20825C104 22,341 478,504 SH   SOLE   258,333 0 220,171
Corning COM 219350105 54,564 2,984,882 SH   SOLE   2,325,415 0 659,467
Costco Wholesale COM 22160K105 468 2,898 SH   SOLE   1,115 0 1,783
Cray Inc COM 225223304 79,675 2,455,306 SH   SOLE   1,997,588 0 457,718
Crown Castle Intl Corp COM 22822V101 210 2,425 SH   SOLE   0 0 2,425
CVS Health Corp COM 126650100 373 3,819 SH   SOLE   120 0 3,699
Daktronics, Inc COM 234264109 416 47,760 SH   SOLE   0 0 47,760
Danaher Corp COM 235851102 328 3,534 SH   SOLE   0 0 3,534
Deluxe Corp COM 248019101 35,991 659,894 SH   SOLE   515,093 0 144,801
Disney COM 254687106 82,236 782,608 SH   SOLE   574,741 0 207,867
Dominion Res Inc VA COM 25746U109 404 5,971 SH   SOLE   0 0 5,971
Donaldson COM 257651109 153,479 5,355,148 SH   SOLE   4,042,095 0 1,313,053
Dupont de Nemours COM 263534109 334 5,012 SH   SOLE   0 0 5,012
Ecolab Inc COM 278865100 276,061 2,413,538 SH   SOLE   1,873,274 0 540,264
Emerson Electric COM 291011104 142,462 2,978,510 SH   SOLE   2,088,055 0 890,455
Exelon Corp COM 30161N101 254 9,159 SH   SOLE   731 0 8,428
Exxon Mobil COM 30231G102 61,121 784,100 SH   SOLE   308,090 0 476,010
Facebook Inc Class A COM 30303M102 268 2,562 SH   SOLE   0 0 2,562
Fastenal Co. COM 311900104 89,921 2,202,867 SH   SOLE   1,582,255 0 620,612
Fedex Corp. COM 31428X106 504 3,380 SH   SOLE   0 0 3,380
Fiserv COM 337738108 111,806 1,222,461 SH   SOLE   919,532 0 302,929
G & K Services Cl A COM 361268105 28,833 458,398 SH   SOLE   368,699 0 89,699
Generac Hldgs COM 368736104 24,478 822,236 SH   SOLE   704,605 0 117,631
General Electric COM 369604103 130,482 4,188,824 SH   SOLE   2,948,762 0 1,240,062
General Mills COM 370334104 189,811 3,291,894 SH   SOLE   2,382,408 0 909,486
Gentherm Inc COM 37253A103 5,062 106,795 SH   SOLE   106,795 0 0
Graco Inc COM 384109104 205,432 2,850,450 SH   SOLE   2,144,399 0 706,051
Hawkins Chemical COM 420261109 6,010 168,023 SH   SOLE   161,523 0 6,500
HB Fuller COM 359694106 125,331 3,436,542 SH   SOLE   2,844,425 0 592,117
Hershey COM 427866108 6,170 69,120 SH   SOLE   65,220 0 3,900
Home Depot COM 437076102 27,849 210,577 SH   SOLE   81,140 0 129,437
Honeywell Inc COM 438516106 230,338 2,223,982 SH   SOLE   1,644,502 0 579,480
Hormel COM 440452100 160,422 2,028,609 SH   SOLE   1,482,809 0 545,800
Hub Group Inc Cl A COM 443320106 4,358 132,250 SH   SOLE   132,250 0 0
IBM COM 459200101 27,259 198,072 SH   SOLE   98,488 0 99,584
IDEX Corp COM 45167R104 312 4,072 SH   SOLE   0 0 4,072
IDEXX Laboratories, Inc COM 45168D104 292 3,998 SH   SOLE   0 0 3,998
Intel COM 458140100 14,393 417,800 SH   SOLE   64,916 0 352,884
Intl Flavors/Fragr COM 459506101 479 4,000 SH   SOLE   4,000 0 0
J.P. Morgan Chase & Co COM 46625H100 18,659 282,580 SH   SOLE   149,470 0 133,110
Johnson & Johnson COM 478160104 224,372 2,184,308 SH   SOLE   1,623,351 0 560,957
Kellogg COM 487836108 278 3,850 SH   SOLE   0 0 3,850
Kimberly-Clark COM 494368103 20,268 159,217 SH   SOLE   45,595 0 113,622
Lilly (Eli) COM 532457108 18,639 221,204 SH   SOLE   101,740 0 119,464
Lowes Companies Inc COM 548661107 465 6,119 SH   SOLE   0 0 6,119
McDonald's Corp COM 580135101 2,059 17,428 SH   SOLE   8,050 0 9,378
MDU Resources Group COM 552690109 34,238 1,868,878 SH   SOLE   1,518,260 0 350,618
Medtronic COM G5960L103 241,771 3,143,155 SH   SOLE   2,347,993 0 795,162
Merck & Co Inc COM 58933Y105 5,527 104,637 SH   SOLE   11,364 0 93,273
Microsoft COM 594918104 8,858 159,657 SH   SOLE   27,480 0 132,177
MMM Co. COM 88579Y101 273,797 1,817,560 SH   SOLE   1,299,980 0 517,580
MOCON Inc COM 607494101 2,736 186,905 SH   SOLE   179,705 0 7,200
Mondelez Intl Cl A COM 609207105 200 4,464 SH   SOLE   0 0 4,464
MTS Systems COM 553777103 97,409 1,536,183 SH   SOLE   1,244,700 0 291,483
NextEra Energy, Inc. COM 65339F101 346 3,333 SH   SOLE   0 0 3,333
Nike COM 654106103 338 5,400 SH   SOLE   1,200 0 4,200
Norfolk Southern Corp COM 655844108 298 3,527 SH   SOLE   0 0 3,527
Northern Oil & Gas Inc COM 665531109 963 249,480 SH   SOLE   242,980 0 6,500
Novartis COM 66987V109 351 4,080 SH   SOLE   0 0 4,080
NVE Corp COM 629445206 29,526 525,566 SH   SOLE   436,140 0 89,426
NW Biotherapeutics COM 66737P600 40 12,500 SH   SOLE   0 0 12,500
Oasis Petroleum Inc COM 674215108 1,338 181,600 SH   SOLE   181,600 0 0
Oracle Sys COM 68389X105 1,152 31,537 SH   SOLE   0 0 31,537
Oshkosh Corp COM 688239201 6,904 176,840 SH   SOLE   176,840 0 0
Patterson Companies COM 703395103 62,674 1,386,294 SH   SOLE   954,825 0 431,469
Pentair PLC COM G7S00T104 132,417 2,673,476 SH   SOLE   1,975,310 0 698,166
PepsiCo Inc COM 713448108 1,123 11,237 SH   SOLE   400 0 10,837
Pfizer Inc COM 717081103 125,806 3,897,329 SH   SOLE   3,020,291 0 877,038
Philip Morris Intl Inc COM 718172109 712 8,098 SH   SOLE   0 0 8,098
Phillips 66 COM 718546104 2,048 25,042 SH   SOLE   0 0 25,042
Physicians Realty Tr COM 71943U104 6,856 406,670 SH   SOLE   406,670 0 0
Polaris Ind COM 731068102 349 4,063 SH   SOLE   0 0 4,063
Principal Financial COM 74251V102 130,042 2,891,114 SH   SOLE   2,217,460 0 673,654
PrivateBancorp Inc COM 742962103 6,457 157,400 SH   SOLE   157,400 0 0
Procter & Gamble COM 742718109 23,492 295,836 SH   SOLE   49,790 0 246,046
Proto Labs COM 743713109 13,898 218,219 SH   SOLE   208,840 0 9,379
PureCycle Corp COM 746228303 57 11,855 SH   SOLE   0 0 11,855
Qualcomm, Inc. COM 747525103 66,356 1,327,509 SH   SOLE   1,093,060 0 234,449
Raven Industries Inc COM 754212108 3,612 231,553 SH   SOLE   231,053 0 500
Roche Hldg Ltd ADR COM 771195104 93,569 2,714,500 SH   SOLE   2,227,295 0 487,205
Royal Bank of Canada COM 780087102 948 17,690 SH   SOLE   0 0 17,690
Royal Dutch Shell Spons ADR A COM 780259206 420 9,170 SH   SOLE   400 0 8,770
Schlumberger COM 806857108 154,951 2,221,524 SH   SOLE   1,753,523 0 468,001
Snap-On Inc. COM 833034101 7,271 42,416 SH   SOLE   21,505 0 20,911
SPS Commerce Inc COM 78463M107 3,984 56,750 SH   SOLE   56,750 0 0
St. Jude Medical COM 790849103 139,487 2,258,163 SH   SOLE   1,735,320 0 522,843
Starbucks Corp COM 855244109 237 3,940 SH   SOLE   0 0 3,940
Stratasys Ltd COM M85548101 30,649 1,305,313 SH   SOLE   1,151,650 0 153,663
SurModics Inc COM 868873100 422 20,825 SH   SOLE   0 0 20,825
Sysco COM 871829107 274 6,687 SH   SOLE   0 0 6,687
Target COM 87612E106 178,265 2,455,100 SH   SOLE   1,744,319 0 710,781
TCF Financial COM 872275102 2,325 164,689 SH   SOLE   0 0 164,689
Tennant Company COM 880345103 444 7,900 SH   SOLE   0 0 7,900
Thermo Fisher Scientific COM 883556102 246 1,735 SH   SOLE   52 0 1,683
Toro COM 891092108 157,602 2,156,862 SH   SOLE   1,695,818 0 461,044
Travelers Cos Inc COM 89417E109 67,180 595,249 SH   SOLE   377,438 0 217,811
Union Pacific COM 907818108 211 2,696 SH   SOLE   93 0 2,603
United Fire Group COM 910340108 7,524 196,407 SH   SOLE   189,807 0 6,600
United Health Group COM 91324P102 2,533 21,530 SH   SOLE   75 0 21,455
United Parcel Service COM 911312106 119,807 1,245,012 SH   SOLE   906,898 0 338,114
United Technologies COM 913017109 976 10,157 SH   SOLE   0 0 10,157
Urologix Inc COM 917273104 0 20,000 SH   SOLE   0 0 20,000
US Bancorp COM 902973304 268,406 6,290,271 SH   SOLE   4,861,832 0 1,428,439
Valspar COM 920355104 237,463 2,862,721 SH   SOLE   2,124,066 0 738,655
VASCO Data Security Intl COM 92230Y104 4,300 257,006 SH   SOLE   257,006 0 0
Vascular Solutions COM 92231M109 2,402 69,853 SH   SOLE   69,853 0 0
Verizon Comm COM 92343V104 8,839 191,243 SH   SOLE   14,366 0 176,877
Visa, Inc COM 92826C839 625 8,057 SH   SOLE   0 0 8,057
Walgreen Boots Alliance COM 931427108 1,043 12,245 SH   SOLE   0 0 12,245
WalMart COM 931142103 501 8,172 SH   SOLE   2,000 0 6,172
WEC Energy Group COM 92939U106 231 4,494 SH   SOLE   0 0 4,494
Wells Fargo & Co COM 949746101 150,314 2,765,150 SH   SOLE   1,876,492 0 888,658
Westamerica Bancorporation COM 957090103 251 5,359 SH   SOLE   0 0 5,359
Western Union COM 959802109 87,132 4,864,988 SH   SOLE   3,827,955 0 1,037,033
Weyerhaeuser COM 962166104 297 9,905 SH   SOLE   2,572 0 7,333
Wintrust Finan Corp COM 97650W108 6,280 129,430 SH   SOLE   129,430 0 0
Workiva Inc COM 98139A105 1,466 83,423 SH   SOLE   83,423 0 0
Xcel Energy Inc. COM 98389B100 18,018 501,742 SH   SOLE   240,485 0 261,257
Zimmer Biomet Holdings, Inc. COM 98956P102 76,520 745,878 SH   SOLE   570,864 0 175,014
Energy Select SPDR ETF 81369Y506 377 6,258 SH   SOLE   0 0 6,258
First Tr Lrg Cp Vl Alphadex ETF 33735J101 347 9,040 SH   SOLE   0 0 9,040
iShares Cohen & Steers Reit ET ETF 464287564 250 2,515 SH   SOLE   0 0 2,515
iShares Core S&P 500 ETF ETF 464287200 1,126 5,496 SH   SOLE   300 0 5,196
iShares Core S&P Midcap ETF ETF 464287507 356 2,555 SH   SOLE   0 0 2,555
iShares MSCI EAFE Fd ETF 464287465 923 15,722 SH   SOLE   0 0 15,722
iShares Russell 1000 Growth ETF 464287614 701 7,045 SH   SOLE   0 0 7,045
iShares Russell 1000 Value ETF 464287598 463 4,735 SH   SOLE   0 0 4,735
iShares Russell 2000 ETF ETF 464287655 504 4,472 SH   SOLE   302 0 4,170
iShares Russell Midcap ETF ETF 464287499 735 4,591 SH   SOLE   311 0 4,280
iShares S&P Smallcap ETF 464287887 206 1,655 SH   SOLE   0 0 1,655
iShares Select Div ETF 464287168 581 7,734 SH   SOLE   300 0 7,434
Midcap SPDR Tr Series 1 ETF 78467Y107 278 1,095 SH   SOLE   0 0 1,095
Schwab Intl Eq ETF ETF 808524805 1,455 52,800 SH   SOLE   0 0 52,800
Schwab US Broad Mkt ETF ETF 808524102 2,733 55,730 SH   SOLE   0 0 55,730
SPDR S&P 500 ETF Trust ETF 78462F103 6,750 33,107 SH   SOLE   785 0 32,322
Vanguard Index Small Cap ETF 922908751 335 3,030 SH   SOLE   0 0 3,030
Nuveen MN Muni Income Fd COM 670734102 540 37,002 SH   SOLE   0 0 37,002