| Revenue | 31/12/2018 | 31/12/2017 | 31/12/2016 | 31/12/2015 |
| Total revenue | 41,802,000 | 40,534,000 | 39,302,000 | 38,581,000 |
| Cost of revenue | 29,046,000 | 28,144,000 | 27,677,000 | 26,747,000 |
| Gross profit | 12,756,000 | 12,390,000 | 11,625,000 | 11,834,000 |
| Operating expenses |
| Research development | - | - | - | - |
| Selling general and administrative | 4,854,000 | 5,191,000 | 4,937,000 | 5,006,000 |
| Non-recurring | - | - | - | - |
| Others | 57,000 | 82,000 | 201,000 | 201,000 |
| Total operating expenses | 33,957,000 | 33,417,000 | 32,815,000 | 31,753,000 |
| Operating income or loss | 7,845,000 | 7,117,000 | 6,487,000 | 6,828,000 |
| Income from continuing operations |
| Total other income/expenses net | -358,000 | -167,000 | -35,000 | -242,000 |
| Earnings before interest and taxes | 7,845,000 | 7,117,000 | 6,487,000 | 6,828,000 |
| Interest expense | -367,000 | -316,000 | -338,000 | -310,000 |
| Income before tax | 7,487,000 | 6,950,000 | 6,452,000 | 6,586,000 |
| Income tax expense | 659,000 | 5,362,000 | 1,603,000 | 1,739,000 |
| Minority interest | 185,000 | 168,000 | 181,000 | 425,000 |
| Net income from continuing ops | 6,828,000 | 1,588,000 | 4,849,000 | 4,847,000 |
| Non-recurring events |
| Discontinued operations | - | - | - | - |
| Extraordinary items | - | - | - | - |
| Effect of accounting changes | - | - | - | - |
| Other items | - | - | - | - |
| Net income |
| Net income | 6,765,000 | 1,545,000 | 4,812,000 | 4,768,000 |
| Preferred stock and other adjustments | - | - | - | - |
| Net income applicable to common shares | 6,765,000 | 1,545,000 | 4,812,000 | 4,768,000 |