| Revenue | 12/31/2018 | 12/31/2017 | 12/31/2016 | 12/31/2015 |
| Total Revenue | 39,004,000 | 34,484,000 | 29,183,000 | 32,735,000 |
| Cost of Revenue | 32,529,000 | 28,059,000 | 23,191,000 | 25,683,000 |
| Gross Profit | 6,475,000 | 6,425,000 | 5,992,000 | 7,052,000 |
| Operating Expenses |
| Research Development | 115,000 | 106,000 | 99,000 | 102,000 |
| Selling General and Administrative | 1,037,000 | 843,000 | 880,000 | 828,000 |
| Non Recurring | - | - | - | - |
| Others | - | - | - | - |
| Total Operating Expenses | 33,681,000 | 29,008,000 | 24,170,000 | 26,613,000 |
| Operating Income or Loss | 5,323,000 | 5,476,000 | 5,013,000 | 6,122,000 |
| Income from Continuing Operations |
| Total Other Income/Expenses Net | -14,000 | 17,000 | 220,000 | 87,000 |
| Earnings Before Interest and Taxes | 5,323,000 | 5,476,000 | 5,013,000 | 6,122,000 |
| Interest Expense | -362,000 | -491,000 | -322,000 | -310,000 |
| Income Before Tax | 5,309,000 | 5,493,000 | 5,233,000 | 6,209,000 |
| Income Tax Expense | 613,000 | 598,000 | 1,386,000 | 1,730,000 |
| Minority Interest | 139,000 | 1,000 | 25,000 | 24,000 |
| Net Income From Continuing Ops | 4,696,000 | 4,895,000 | 3,847,000 | 4,479,000 |
| Non-recurring Events |
| Discontinued Operations | -8,000 | -18,000 | -10,000 | -5,000 |
| Extraordinary Items | - | - | - | - |
| Effect Of Accounting Changes | - | - | - | - |
| Other Items | - | - | - | - |
| Net Income |
| Net Income | 4,688,000 | 4,879,000 | 3,836,000 | 4,476,000 |
| Preferred Stock And Other Adjustments | - | - | - | - |
| Net Income Applicable To Common Shares | 4,680,000 | 4,874,000 | 3,832,000 | 4,468,000 |