| Revenue | 5/31/2018 | 5/31/2017 | 5/31/2016 | 5/31/2015 |
| Total Revenue | 39,831,000 | 37,728,000 | 37,047,000 | 38,226,000 |
| Cost of Revenue | 8,081,000 | 7,469,000 | 7,479,000 | 7,532,000 |
| Gross Profit | 31,750,000 | 30,259,000 | 29,568,000 | 30,694,000 |
| Operating Expenses |
| Research Development | 6,091,000 | 6,159,000 | 5,787,000 | 5,524,000 |
| Selling General and Administrative | 9,720,000 | 9,373,000 | 9,039,000 | 8,732,000 |
| Non Recurring | - | - | - | - |
| Others | - | - | - | - |
| Total Operating Expenses | 25,512,000 | 24,452,000 | 23,943,000 | 23,937,000 |
| Operating Income or Loss | 14,319,000 | 13,276,000 | 13,104,000 | 14,289,000 |
| Income from Continuing Operations |
| Total Other Income/Expenses Net | -1,428,000 | -1,759,000 | -1,662,000 | -1,455,000 |
| Earnings Before Interest and Taxes | 14,319,000 | 13,276,000 | 13,104,000 | 14,289,000 |
| Interest Expense | -2,025,000 | -1,798,000 | -1,467,000 | -1,143,000 |
| Income Before Tax | 12,891,000 | 11,517,000 | 11,442,000 | 12,834,000 |
| Income Tax Expense | 9,066,000 | 2,182,000 | 2,541,000 | 2,896,000 |
| Minority Interest | 498,000 | 386,000 | 501,000 | 435,000 |
| Net Income From Continuing Ops | 3,825,000 | 9,335,000 | 8,901,000 | 9,938,000 |
| Non-recurring Events |
| Discontinued Operations | - | - | - | - |
| Extraordinary Items | - | - | - | - |
| Effect Of Accounting Changes | - | - | - | - |
| Other Items | - | - | - | - |
| Net Income |
| Net Income | 3,825,000 | 9,335,000 | 8,901,000 | 9,938,000 |
| Preferred Stock And Other Adjustments | - | - | - | - |
| Net Income Applicable To Common Shares | 3,825,000 | 9,335,000 | 8,901,000 | 9,938,000 |