| In millions, except per share items | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 | Jun-30-20 |
| | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 8-K | 10-Q |
| Current assets: | | | | | | | | |
| Cash and cash equivalents | 5.3 | 5.6 | 13.0 | 6.1 | 11.8 | 8.6 | 16.1 | 7.1 |
| Restricted cash | 0.6 | 0.6 | 0.6 | 0.7 | 0.7 | 0.7 | 0.6 | 0.6 |
| Short-term investment securities | 15.5 | 19.4 | 20.0 | 23.0 | | 19.8 | 14.2 | |
| Accounts receivable, less provision for doubtful accounts of $65 at March 31, 2022 and $69 at December 31, 2021 | 11.1 | 8.3 | 9.7 | 9.6 | 9.5 | 10.1 | | 10.4 |
| Inventories | 28.4 | 24.5 | 22.2 | 22.2 | | 19.5 | 20.5 | |
| Contract assets | 12.6 | | | | | | | |
| Other current assets | 3.1 | 4.6 | 2.2 | 1.9 | 2.0 | 1.5 | 1.4 | 1.6 |
| Total current assets | 76.6 | 74.4 | 79.3 | 75.0 | 76.6 | 69.3 | 72.6 | 68.8 |
| Property, plant and equipment | 49.8 | 48.2 | 47.7 | 47.3 | 46.5 | 45.7 | 45.1 | 44.6 |
| Less: Accumulated depreciation | 34.9 | 34.4 | 33.8 | 33.1 | 32.3 | 31.5 | 30.9 | 30.2 |
| Net property, plant and equipment | 14.8 | 13.8 | 13.9 | 14.2 | 14.2 | 14.2 | 14.2 | 14.4 |
| Goodwill | 13.9 | 13.9 | 13.9 | 13.9 | 13.8 | 13.7 | 13.7 | 13.6 |
| Intangible assets, net | 8.6 | 9.0 | 9.5 | 9.8 | | 10.8 | | |
| Operating lease right-of-use assets, net | 6.3 | | | | | | | |
| Investment in partnerships | 0.6 | 0.5 | 0.5 | 0.6 | | 0.6 | | |
| Long-term investment securities | 4.6 | 4.6 | | 3.8 | 2.8 | 5.1 | | 3.0 |
| Other assets, net | 1.2 | 1.2 | 1.1 | 1.0 | 0.9 | 1.0 | 0.3 | 0.3 |
| Total assets | 126.5 | 122.5 | 123.4 | 124.1 | 125.3 | 121.3 | 116.5 | 116.1 |
| |
| Current liabilities: | | | | | | | | |
| Current financing leases | 0.0 | | | | | | | |
| Current operating leases | 1.9 | | | | | | | |
| Accounts payable | 13.3 | 9.4 | 10.3 | 10.1 | 12.1 | 8.7 | 8.3 | 9.5 |
| Accrued salaries, wages and commissions | 4.5 | 5.2 | 5.1 | 4.4 | 3.9 | 3.6 | 4.3 | 3.8 |
| Other accrued liabilities | 4.2 | 3.8 | 4.2 | 6.1 | | 4.2 | 4.4 | |
| Total current liabilities | 23.9 | 20.2 | 21.5 | 22.6 | 22.5 | 18.7 | 18.6 | 19.4 |
| Deferred tax liabilities, net | 0.9 | 0.9 | 1.0 | 1.0 | 1.0 | 1.0 | 1.1 | 1.1 |
| Other long-term liabilities | 2.4 | 3.1 | 3.4 | 3.4 | 4.1 | 4.4 | 3.8 | 3.9 |
| Total liabilities | 32.7 | 28.7 | 30.5 | 32.1 | 33.0 | 30.1 | 27.0 | 27.6 |
| |
| Commitments and contingencies (Note 11) | | | | | | | | |
| Shareholders’ equity: | | | | | | | | |
| Common stock | 9.3 | 9.2 | 9.1 | 9.1 | 9.0 | 9.0 | 8.9 | 8.9 |
| Additional paid-in capital | 92.3 | 91.8 | 91.0 | 90.5 | 89.9 | 89.7 | 88.9 | 88.8 |
| Accumulated deficit | -7.6 | -6.9 | -6.9 | -7.3 | -6.1 | -6.8 | -7.9 | -8.5 |
| Accumulated other comprehensive loss | -0.4 | -0.4 | -0.4 | -0.4 | -0.5 | -0.7 | -0.5 | -0.5 |
| Total shareholders' equity | 93.6 | 93.7 | 92.8 | 91.9 | 92.3 | 91.2 | 179.0 | 88.7 |
| Non-controlling interest | 0.2 | 0.1 | 0.1 | 0.1 | | 0.0 | | |
| Total equity | 93.8 | 93.8 | 92.9 | 92.0 | 92.2 | 91.2 | | 88.4 |
| Total liabilities and equity | 126.5 | 122.5 | 123.4 | 124.1 | 125.3 | 121.3 | 116.5 | 116.1 |