| Revenue | 31/12/2018 | 31/12/2017 | 31/12/2016 | 31/12/2015 |
| Total revenue | 44,438,000 | 41,138,000 | 39,450,000 | 40,704,000 |
| Cost of revenue | 33,234,000 | 29,773,000 | 27,646,000 | 28,663,000 |
| Gross profit | 11,204,000 | 11,365,000 | 11,804,000 | 12,041,000 |
| Operating expenses |
| Research development | - | - | - | - |
| Selling general and administrative | 1,746,000 | 1,877,000 | 2,073,000 | 1,672,000 |
| Non-recurring | - | - | - | - |
| Others | 1,723,000 | 1,609,000 | 1,621,000 | 2,033,000 |
| Total operating expenses | 39,032,000 | 35,481,000 | 33,226,000 | 34,203,000 |
| Operating income or loss | 5,406,000 | 5,657,000 | 6,224,000 | 6,501,000 |
| Income from continuing operations |
| Total other income/expenses net | -255,000 | -157,000 | 129,000 | 656,000 |
| Earnings before interest and taxes | 5,406,000 | 5,657,000 | 6,224,000 | 6,501,000 |
| Interest expense | -311,000 | -396,000 | -388,000 | -481,000 |
| Income before tax | 5,151,000 | 5,500,000 | 6,353,000 | 7,157,000 |
| Income tax expense | 1,216,000 | 2,295,000 | 2,158,000 | 2,631,000 |
| Minority interest | - | - | - | - |
| Net income from continuing ops | 3,935,000 | 3,205,000 | 4,195,000 | 4,526,000 |
| Non-recurring events |
| Discontinued operations | - | - | - | - |
| Extraordinary items | - | - | - | - |
| Effect of accounting changes | - | - | - | - |
| Other items | - | - | - | - |
| Net income |
| Net income | 3,935,000 | 3,205,000 | 4,195,000 | 4,526,000 |
| Preferred stock and other adjustments | - | - | - | - |
| Net income applicable to common shares | 3,935,000 | 3,205,000 | 4,195,000 | 4,526,000 |