| Revenue | 31/12/2018 | 31/12/2017 | 31/12/2016 | 31/12/2015 |
| Total revenue | 235,849,000 | 229,550,000 | 217,267,000 | 213,292,000 |
| Cost of revenue | 191,462,000 | 187,848,000 | 177,691,000 | 180,756,000 |
| Gross profit | 44,387,000 | 41,702,000 | 39,576,000 | 32,536,000 |
| Operating expenses |
| Research development | - | - | - | - |
| Selling general and administrative | 26,767,000 | 26,546,000 | 27,913,000 | 28,616,000 |
| Non-recurring | - | - | - | - |
| Others | -11,000 | 70,000 | -3,307,000 | -3,078,000 |
| Total operating expenses | 218,218,000 | 214,464,000 | 202,297,000 | 206,294,000 |
| Operating income or loss | 17,631,000 | 15,086,000 | 14,970,000 | 6,998,000 |
| Income from continuing operations |
| Total other income/expenses net | -1,988,000 | -1,413,000 | -7,679,000 | -8,299,000 |
| Earnings before interest and taxes | 17,631,000 | 15,086,000 | 14,970,000 | 6,998,000 |
| Interest expense | -924,000 | -1,715,000 | -2,224,000 | -1,371,000 |
| Income before tax | 15,643,000 | 13,673,000 | 7,291,000 | -1,301,000 |
| Income tax expense | 3,490,000 | 2,210,000 | 1,912,000 | 59,000 |
| Minority interest | 225,000 | 229,000 | 221,000 | 210,000 |
| Net income from continuing ops | 12,153,000 | 11,463,000 | 5,379,000 | -1,360,000 |
| Non-recurring events |
| Discontinued operations | - | - | - | - |
| Extraordinary items | - | - | - | - |
| Effect of accounting changes | - | - | - | - |
| Other items | - | - | - | - |
| Net income |
| Net income | 12,136,000 | 11,453,000 | 5,369,000 | -1,370,000 |
| Preferred stock and other adjustments | - | - | - | - |
| Net income applicable to common shares | 11,827,000 | 11,179,000 | 5,144,000 | -1,582,000 |