| Quarterly Key indicators | Q4/2022 | Q3/2022 | Q2/2022 | Q1/2022 | Q4/2021 |
| Net sales, M€ | 10.1 | 10.4 | 9.6 | 9.0 | 10.8 |
| Operating result before depreciation (EBITDA), M€ | 1.2 | 1.9 | 2.1 | 1.3 | 1.7 |
| Operating result (EBIT), M€ | 0.7 | 1.4 | 1.6 | 0.8 | 1.2 |
| of net sales, % | 7% | 13% | 17% | 9% | 12% |
| Profit/loss before taxes, M€ | 0.7 | 1.3 | 1.6 | 0.8 | 1.2 |
| of net sales, % | 7% | 13% | 17% | 9% | 11% |
| Net profit/loss for the period, M€ | -0.2 | 1.3 | 1.6 | 0.8 | 1.1 |
| of net sales, % | -2% | 13% | 17% | 8% | 11% |
| Equity ratio, % | 69% | 68% | 67% | 67% | 61% |
| Gearing, % | 8% | 5% | 11% | 9% | 9% |
| Gross investments in fixed assets, M€ | 0.7 | 0.6 | 0.3 | 0.9 | 0.4 |
| of net sales, % | 7% | 6% | 4% | 10% | 4% |
| Personnel, end of the quarter | 156 | 144 | 148 | 140 | 145 |
| Earnings/share (EPS), € | -0.02 | 0.20 | 0.23 | 0.11 | 0.17 |
| Equity/share, € | 3.19 | 3.20 | 3.00 | 2.91 | 2.80 |