| Revenue | 12/31/2018 | 12/31/2017 | 12/31/2016 | 12/31/2015 |
| Total Revenue | 71,861,000 | 66,585,000 | 61,610,000 | 58,363,000 |
| Cost of Revenue | 58,731,000 | 52,719,000 | 49,902,000 | 43,975,000 |
| Gross Profit | 13,130,000 | 13,866,000 | 11,708,000 | 14,388,000 |
| Operating Expenses |
| Research Development | - | - | - | - |
| Selling General and Administrative | 1,362,000 | 1,362,000 | 1,362,000 | 1,362,000 |
| Non Recurring | - | - | - | - |
| Others | 5,465,000 | 5,055,000 | 4,619,000 | 4,636,000 |
| Total Operating Expenses | 66,403,000 | 60,056,000 | 56,745,000 | 50,695,000 |
| Operating Income or Loss | 5,458,000 | 6,529,000 | 4,865,000 | 7,668,000 |
| Income from Continuing Operations |
| Total Other Income/Expenses Net | 561,000 | 608,000 | 229,000 | -326,000 |
| Earnings Before Interest and Taxes | 5,458,000 | 6,529,000 | 4,865,000 | 7,668,000 |
| Interest Expense | -605,000 | -453,000 | -381,000 | -341,000 |
| Income Before Tax | 6,019,000 | 7,137,000 | 5,121,000 | 7,342,000 |
| Income Tax Expense | 1,228,000 | 2,232,000 | 1,699,000 | 2,498,000 |
| Minority Interest | 16,000 | 30,000 | 24,000 | 21,000 |
| Net Income From Continuing Ops | 4,791,000 | 4,905,000 | 3,422,000 | 4,844,000 |
| Non-recurring Events |
| Discontinued Operations | - | - | - | - |
| Extraordinary Items | - | - | - | - |
| Effect Of Accounting Changes | - | - | - | - |
| Other Items | - | - | - | - |
| Net Income |
| Net Income | 4,791,000 | 4,905,000 | 3,422,000 | 4,844,000 |
| Preferred Stock And Other Adjustments | - | - | - | - |
| Net Income Applicable To Common Shares | 4,791,000 | 4,905,000 | 3,422,000 | 4,844,000 |