| x € 1.000 | 2018 | 2017 | 2016 | 2015 | 2014 |
| Net revenue | 208,388 | 169,323 | 162,374 | 113,437 | 91,598 |
| Material usage | 102,560 | 79,773 | 77,226 | 56,605 | 49,170 |
| Gross margin | 105,828 | 89,550 | 85,148 | 56,832 | 42,428 |
| Operating costs | 98,161 | 81,239 | 77,778 | 51,734 | 36,204 |
| Extraordinary income and expenses | 1,263 | 801 | 2,732 | ||
| Operating income | 8,930 | 8,311 | 8,171 | 7,830 | 6,224 |
| Interest income and expenses | -1,165 | -1,003 | -1,269 | -148 | -420 |
| Profit from normal business operations before taxes | 7,765 | 7,308 | 6,902 | 7,682 | 5,804 |
| Taxes | -473 | 195 | 1,031 | 1,040 | 1,234 |
| Result from investments in associates | 269 | 16 | 11 | 234 | 4 |
| Profit discontinued activities | 4,690 | 3,307 | |||
| Net profit | 8,507 | 7,129 | 5,882 | 11,566 | 7,881 |
| Net profit attributable to: | |||||
| Shareholders | 8,507 | 7,129 | 5,882 | 10,784 | 6,873 |
| Minority interest | 782 | 1,008 |
| x € 1,000 | 2018 | 2017 | 2016 | 2015 | 2014 |
| Assets | |||||
| Fixed assets | 82,712 | 66,035 | 62,822 | 62,522 | 42,585 |
| Current assets | 81,666 | 65,025 | 53,727 | 49,411 | 23,633 |
| Cash and cash equivalents | 3,504 | 7,222 | 1,914 | 8,245 | 11,507 |
| Total | 167,882 | 138,282 | 118,463 | 120,178 | 77,725 |
| Liabilities | |||||
| Shareholders’ equity | 59,189 | 53,399 | 48,390 | 42,791 | 35,828 |
| Minority interests | 2,452 | ||||
| Group equity | 59,189 | 53,399 | 48,390 | 42,791 | 38,280 |
| Provisions and non-current debts | 30,225 | 19,817 | 20,586 | 22,645 | 8,921 |
| Current debts (excl. owed to banks) | 74,165 | 61,978 | 46,961 | 50,587 | 28,429 |
| Owed to banks | 4,303 | 3,088 | 2,526 | 4,155 | 2,095 |
| Total | 167,882 | 138,282 | 118,463 | 120,178 | 77,725 |
| 2018 | 2017 | 2016 | 2015 | 2014 | |
| Operating profit as % of revenu | 4.30% | 4.90% | 5.00% | 6.90% | 6.80% |
| Return on invested capital | 9.60% | 11.80% | 9.50% | 5.30% | 11.90% |
| Return on shareholders’ equity | 15.10% | 14.00% | 11.70% | 7.90% | 12.30% |
| Solvency | 35.30% | 38.60% | 40.80% | 35.60% | 49.30% |
| x € 1,000 | 2018 | 2017 | 2016 | 2015 | 2014 |
| Cash flow form operating activities | 9,510 | 13,962 | 5,760 | 7,550 | 9,383 |
| Cash flow from investing activities | -15,010 | -8,000 | -8,085 | -3,743 | 7,867 |
| Cash flow form financing activities | 2,063 | -334 | -524 | -9,455 | -3,718 |
| Net cash flow | -3,437 | 5,628 | -2,849 | -5,648 | 13,532 |
| 2018 | 2017 | 2016 | 2015 | 2014 | |
| Average number of employees | 956 | 787 | 788 | 519 | 318 |
| Net revenue per employee (x € 1,000) | 218.1 | 215.1 | 206.1 | 218.6 | 288.0 |
| Salary costs per employee (x € 1,000) | 56.9 | 56.2 | 56.3 | 57.0 | 58.4 |
| x € 1 | 2018 | 2017 | 2016 | 2015 | 2014 |
| Operating profit continued operations | 6.96 | 6.52 | 6.55 | 6.41 | 5.09 |
| Shareholders’s equity | 46.13 | 41.92 | 38.81 | 35.01 | 29.32 |
| Profit per share | 6.63 | 5.60 | 4.72 | 8.82 | 5.62 |
| Profit per share continued operations | 6.63 | 5.60 | 4.72 | 5.21 | 2.91 |
| Dividend | 2.70 | 2.25 | 1.70 | 1.37 | 1.37 |