| Revenue | 3/31/2019 | 3/31/2018 | 3/31/2017 | 3/31/2016 |
| Total Revenue | 11,799,000 | 10,939,000 | 10,208,000 | 9,501,000 |
| Cost of Revenue | 7,687,000 | 7,128,000 | 6,591,000 | 6,059,000 |
| Gross Profit | 4,112,000 | 3,811,000 | 3,617,000 | 3,442,000 |
| Operating Expenses |
| Research Development | - | - | - | - |
| Selling General and Administrative | 1,416,000 | 1,150,000 | 1,097,000 | 1,040,000 |
| Non Recurring | - | - | - | - |
| Others | - | - | - | - |
| Total Operating Expenses | 9,103,000 | 8,278,000 | 7,688,000 | 7,099,000 |
| Operating Income or Loss | 2,696,000 | 2,661,000 | 2,520,000 | 2,402,000 |
| Income from Continuing Operations |
| Total Other Income/Expenses Net | 307,000 | 482,000 | 454,000 | 449,000 |
| Earnings Before Interest and Taxes | 2,696,000 | 2,661,000 | 2,520,000 | 2,402,000 |
| Interest Expense | - | - | - | - |
| Income Before Tax | 3,003,000 | 3,143,000 | 2,974,000 | 2,851,000 |
| Income Tax Expense | 803,000 | 657,000 | 834,000 | 799,000 |
| Minority Interest | 9,000 | 9,000 | 9,000 | 9,000 |
| Net Income From Continuing Ops | 2,200,000 | 2,486,000 | 2,140,000 | 2,052,000 |
| Non-recurring Events |
| Discontinued Operations | - | - | - | - |
| Extraordinary Items | - | - | - | - |
| Effect Of Accounting Changes | - | - | - | - |
| Other Items | - | - | - | - |
| Net Income |
| Net Income | 2,199,000 | 2,486,000 | 2,140,000 | 2,052,000 |
| Preferred Stock And Other Adjustments | - | - | - | - |
| Net Income Applicable To Common Shares | 2,199,000 | 2,486,000 | 2,140,000 | 2,052,000 |