| In millions, except per share items | Jun-30-19 | Mar-31-19 | Dec-31-18 | Sep-30-18 | Jun-30-18 | Mar-31-18 | Dec-31-17 | Sep-30-17 |
| | 10-K/A | 10-Q | 10-Q | 10-Q | 10-K/A | 10-Q | 10-Q | 10-Q |
| Net revenues | 10.0 | 9.5 | 9.0 | 9.3 | 9.5 | 9.1 | 8.5 | 8.6 |
| Net revenues growth | 4.7% | 4.1% | 5.4% | 7.7% | 15.1% | 15.7% | 15.1% | 7.1% |
| Cost of revenues | 4.2 | 4.4 | 4.1 | 4.1 | 4.1 | 4.1 | 4.0 | 3.8 |
| Gross Profit | 5.8 | 5.0 | 4.9 | 5.2 | 5.4 | 5.0 | 4.5 | 4.8 |
| Gross margin | 58.2% | 53.1% | 54.6% | 56.3% | 56.5% | 54.6% | 53.0% | 55.9% |
| |
| Operating Expenses | | | | | | | | |
| Research and development | 1.5 | 1.6 | 1.4 | 1.2 | 1.3 | 1.3 | 1.2 | 1.0 |
| Sales and marketing | 0.8 | 0.8 | 1.0 | 0.8 | 0.9 | 0.8 | 1.0 | 0.8 |
| General and administrative | 2.2 | 1.4 | 1.5 | 1.6 | 1.8 | 1.6 | 1.4 | 1.5 |
| Depreciation and amortization | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Total Operating Expenses | 4.6 | 3.8 | 4.0 | 3.6 | 4.1 | 3.8 | 3.7 | 3.3 |
| Operating Income | 1.2 | 1.2 | 0.9 | 1.6 | 1.3 | 1.2 | 0.8 | 1.5 |
| Operating margin | 12.4% | 12.6% | 10.1% | 17.3% | 13.9% | 13.4% | 9.7% | 17.7% |
| |
| Other Income (Expense) | | | | | | | | |
| Interest expense, net | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 |
| Total other expense, net | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 |
| Income before provision for income taxes | 1.1 | 1.1 | 0.8 | 1.5 | 1.2 | 1.1 | 0.7 | 1.4 |
| Provision for income taxes | 0.2 | 0.2 | 0.1 | 0.3 | 0.3 | -0.1 | 0.8 | 0.3 |
| Net Income | 0.9 | 0.9 | 0.7 | 1.2 | 1.0 | 1.2 | -0.1 | 1.1 |
| |
| Earnings per share attributed to common stockholders - basic | $0.08 | $0.07 | $0.06 | $0.10 | $0.08 | $0.10 | ($0.01) | $0.09 |
| Earnings per share attributed to common stockholders - diluted | $0.07 | $0.07 | $0.06 | $0.10 | $0.08 | $0.10 | ($0.01) | $0.09 |
| |
| Weighted average common shares outstanding – basic (in shares) | 12.2 | 12.1 | 12.2 | 12.1 | 11.8 | 11.8 | 11.8 | 11.8 |
| Weighted average common shares outstanding – diluted (in shares) | 12.2 | 12.2 | 12.2 | 12.2 | 11.9 | 12.2 | 11.8 | 11.9 |
| Net Income | 0.9 | 0.9 | 0.7 | 1.2 | 1.0 | 1.2 | -0.1 | 1.1 |
| Foreign currency translation gain (loss) | -0.3 | 0.3 | -0.3 | -0.2 | -0.7 | 0.4 | 0.1 | 0.3 |
| Total Comprehensive Income | 0.6 | 1.2 | 0.4 | 1.0 | 0.3 | 1.6 | 0.0 | 1.4 |