| Revenue | 12/31/2018 | 12/31/2017 | 12/31/2016 | 12/31/2015 |
| Total Revenue | 11,821,400 | 10,086,500 | 8,678,200 | 7,864,252 |
| Cost of Revenue | 10,044,400 | 8,570,400 | 7,376,900 | 6,688,618 |
| Gross Profit | 1,777,000 | 1,516,100 | 1,301,300 | 1,175,634 |
| Operating Expenses |
| Research Development | - | - | - | - |
| Selling General and Administrative | 1,249,000 | 1,043,400 | 899,600 | 792,879 |
| Non Recurring | - | - | - | - |
| Others | - | - | - | - |
| Total Operating Expenses | 11,368,800 | 9,671,500 | 8,325,800 | 7,523,097 |
| Operating Income or Loss | 452,600 | 415,000 | 352,400 | 341,155 |
| Income from Continuing Operations |
| Total Other Income/Expenses Net | -115,100 | -67,900 | -68,900 | -78,451 |
| Earnings Before Interest and Taxes | 452,600 | 415,000 | 352,400 | 341,155 |
| Interest Expense | -118,300 | -74,100 | -48,800 | -39,025 |
| Income Before Tax | 337,500 | 347,100 | 283,500 | 262,704 |
| Income Tax Expense | 71,800 | 101,900 | 86,400 | 79,705 |
| Minority Interest | - | - | - | - |
| Net Income From Continuing Ops | 265,700 | 245,200 | 197,100 | 182,999 |
| Non-recurring Events |
| Discontinued Operations | - | - | - | - |
| Extraordinary Items | - | - | - | - |
| Effect Of Accounting Changes | - | - | - | - |
| Other Items | - | - | - | - |
| Net Income |
| Net Income | 265,700 | 245,200 | 197,100 | 182,999 |
| Preferred Stock And Other Adjustments | - | - | - | - |
| Net Income Applicable To Common Shares | 265,700 | 245,200 | 197,100 | 182,999 |