| Yearly key indicators | 2021 | 2020 | 2019 | 2018 | 2017 |
| Net sales, M€ | 33.2 | 25.6 | 31.2 | 29.1 | 23.9 |
| Operating result before depreciation (EBITDA), M€ | 4.1 | 1.5 | 4.7 | 4.0 | 1.9 |
| Operating profit/loss (EBIT), M€ | 2.2 | -0.1 | 3.4 | 2.9 | 0.8 |
| Share of net sales, % | 6.8 | -0.5 | 10.9 | 9.9 | 3.5 |
| Pre-tax profit from operations, M€ | 2.2 | -0.4 | 3.3 | 2.8 | 0.8 |
| Share of net sales, % | 6.6 | -1.7 | 10.4 | 9.5 | 3.3 |
| Net profit/loss for the period, M€ | 2.1 | -0.1 | 3.9 | 3.2 | 1.3 |
| Share of net sales, % | 6.4 | -0.4 | 12.6 | 11.1 | 5.3 |
| Net cash flow from operating activities, M€ | 2.3 | 3.7 | 4.3 | 2.0 | 0.8 |
| Return on equity (ROE), % | 11.6 | -0.6 | 23.9 | 24 | 11.2 |
| Return on investment (ROI), % | 9.3 | 0.8 | 18.4 | 19.84 | 10.3 |
| Equity ratio, % | 60.8 | 63.6 | 61.3 | 57.6 | 69.1 |
| Gearing, % | 8.7 | 16.6 | 19.0 | 19.3 | 9.3 |
| Investments, M€ | 1.3 | 2.0 | 3.9 | 3.4 | 1.0 |
| Share of net sales, % | 3.9 | 7.7 | 12.6 | 11.5 | 4.0 |
| Order book at the end of period | 16.5 | 4.4 | 4.4 | 2.8 | 2.5 |
| Personnel, year end | 145 | 138 | 132 | 117 | 113 |
| Personnel, average | 139 | 140 | 124 | 116 | 111 |
| Earnings/share (EPS), € | 0.31 | -0.01 | 0.59 | 0.49 | 0.19 |
| Dividend/share, € | 0,15* | 0,15 | 0.12 | 0,07 | |
| Price/earnings ratio (P/E) | 19.49 | -392.00 | 8.92 | 7.55 | 12.47 |
| *Proposal of the Board of Directors |