| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 67.8 | 49.9 | 38.0 | 28.8 | 21.5 | 26.3 |
| Depreciation and amortization | 1.9 | 1.6 | 1.2 | 1.0 | 0.8 | 0.7 |
| Stock-based compensation | 4.9 | 0.2 | 0.2 | 0.6 | | |
| Deferred taxes | 0.1 | 1.0 | 0.2 | -0.1 | 1.8 | |
| Change in working capital [+] | 3.1 | -15.8 | 14.8 | 11.2 | -3.4 | -9.5 |
| Accounts receivable | 0.3 | -5.3 | -1.5 | 0.8 | 0.8 | -2.3 |
| Inventories | 5.7 | -7.8 | 2.7 | 10.3 | -2.5 | -10.0 |
| Other current assets | 0.5 | -1.2 | 1.9 | -1.9 | -1.1 | |
| Accounts payable | | | 5.0 | 2.3 | -3.5 | 1.9 |
| Accrued expenses | | | 6.7 | -0.3 | 4.3 | |
| Other | -3.4 | -1.5 | | | -1.5 | 0.9 |
| Other operating activities | -79.5 | 23.4 | -56.3 | -45.8 | -18.0 | -13.2 |
| Cash from operations | -1.7 | 60.3 | -1.8 | -4.2 | 2.8 | 4.4 |
| |
| Capital expenditures | -3.8 | -6.0 | -2.8 | -4.2 | -6.1 | -1.4 |
| Purchases of property and equipment | -3.8 | -6.0 | -2.8 | -4.2 | -6.1 | -1.4 |
| Other cash from investing | 12.9 | -26.0 | 0.1 | -10.9 | 1.7 | -0.5 |
| Cash from investing | 9.1 | -31.9 | -2.7 | -15.1 | -4.5 | -1.9 |
| |
| Issuance of common stock, net | | | -1.4 | 4.1 | 48.0 | |
| Option exercises | | 0.1 | | | | |
| Other cash from financing | -5.6 | -28.0 | 5.0 | 14.3 | -44.2 | -3.0 |
| Cash from financing | -5.6 | -28.1 | 3.6 | 18.4 | 3.8 | -3.0 |
| |
| Free cash flow | -5.5 | 54.3 | -4.7 | -8.4 | -3.3 | 2.9 |
| Per share (diluted) | ($0.22) | $2.24 | ($0.19) | ($0.34) | ($0.16) | |
| |
| Cash paid for interest | 0.3 | 0.9 | 1.0 | 0.7 | 2.7 | |
| Cash paid for income taxes | 10.3 | 8.2 | 6.7 | 9.3 | 5.2 | |