| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| ASSETS | | | | | | | | |
| Cash and cash equivalents | 13.8 | 24.2 | 22.2 | 24.8 | 21.8 | 37.7 | 28.7 | 32.0 |
| Restricted cash | 0.9 | 0.9 | 0.9 | 0.9 | 1.5 | 1.5 | 1.5 | 1.5 |
| Accounts receivable, net of allowance of $1,109 and $973 in 2023 and 2022, respectively | 0.2 | 0.1 | 0.2 | 1.0 | 0.1 | 0.3 | 0.3 | 0.4 |
| Income tax receivable | 0.4 | 0.3 | 1.0 | 0.2 | 0.3 | 0.9 | 1.6 | 0.0 |
| Inventories, net | 14.7 | 12.0 | 12.8 | 10.2 | 12.8 | 9.4 | 12.0 | 9.2 |
| Prepaid expenses and other current assets | 2.4 | 2.9 | 3.0 | 2.2 | 3.4 | 2.6 | 3.5 | 2.9 |
| Total current assets | 35.0 | 42.8 | 42.5 | 41.0 | 42.4 | 56.2 | 50.8 | 49.9 |
| Property and equipment, net | 3.8 | 4.2 | 9.9 | 11.4 | 5.9 | 3.5 | 3.6 | 3.8 |
| |
| Construction in progress | | | | | | | | |
| Long-term restricted cash | 0.5 | 0.5 | 4.3 | 5.3 | 7.2 | 7.6 | 6.4 | 6.6 |
| Other assets | 8.4 | 9.2 | 12.0 | 9.6 | 3.9 | 3.9 | 4.0 | 3.8 |
| Deferred tax assets, net | | 2.8 | 1.2 | 0.9 | 1.9 | 4.2 | 5.4 | 3.7 |
| Total assets | 49.1 | 59.6 | 65.3 | 62.9 | 62.2 | 76.2 | 71.2 | 68.6 |
| |
| LIABILITIES AND SHAREHOLDERS’ EQUITY | | | | | | | | |
| Current portion of finance leases | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.4 | 0.4 |
| Accounts payable | 4.4 | 4.0 | 4.8 | 3.5 | 6.7 | 6.0 | 5.2 | 2.7 |
| Accrued expenses | 7.5 | 9.2 | 8.7 | 8.2 | 6.0 | 5.8 | 5.6 | 6.2 |
| Commissions and incentives payable | 9.3 | 9.6 | 11.0 | 9.7 | 12.2 | 9.7 | 8.8 | 6.8 |
| Taxes payable | 3.3 | 2.2 | 1.4 | 2.2 | 2.7 | 2.4 | 1.0 | 0.7 |
| Current notes payable | 0.3 | 0.2 | 0.6 | 0.7 | | | | |
| Total current liabilities | 29.8 | 30.1 | 32.0 | 28.9 | 33.6 | 33.4 | 30.0 | 26.4 |
| Finance leases, excluding current portion | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.3 | 0.6 |
| |
| Deferred tax liabilities | | | | | | | | |
| Long-term notes payable | | | | | | | | |
| Other long-term liabilities | 5.0 | 5.0 | 7.2 | 6.2 | 2.3 | 1.3 | 1.5 | 2.0 |
| Total liabilities | 35.0 | 35.2 | 39.4 | 35.6 | 36.9 | 36.0 | 32.3 | 30.1 |
| |
| Commitments and contingencies | | | | | | | | |
| Shareholders’ equity: | | | | | | | | |
| Common stock | | | | | | | | |
| Additional paid-in capital | 33.4 | 33.3 | 33.8 | 34.1 | 33.9 | 34.9 | 38.2 | 40.5 |
| Retained earnings | 1.7 | 7.7 | 2.2 | -0.7 | -2.8 | 4.2 | 7.3 | 8.6 |
| Accumulated other comprehensive (loss) income | -0.2 | 2.3 | 5.2 | 3.8 | 4.3 | 6.0 | 1.8 | 0.7 |
| Treasury stock, at average cost, 876,645 shares as of June 30, 2023 and 884,057 shares as of December 31, 2022 | -20.7 | -18.9 | -15.2 | -9.9 | -10.2 | -4.9 | -8.5 | -11.2 |
| Total shareholders’ equity | 14.2 | 24.4 | 26.0 | 27.3 | 25.3 | 40.2 | 38.9 | 38.6 |
| Total liabilities and shareholders’ equity | 49.1 | 59.6 | 65.3 | 62.9 | 62.2 | 76.2 | 71.2 | 68.6 |