Note 11 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Federal income taxes at statutory rates | $ 4,861 | $ 5,445 | $ 5,374 |
| State income taxes, net of federal benefit | 302 | 293 | 860 |
| Tax benefit of stock option exercises | (1,576) | (751) | 209 |
| Section 199 manufacturing deduction | (304) | (440) | (317) |
| Research and development credit | (385) | (345) | (248) |
| Other | 215 | 184 | (114) |
| $ 3,113 | $ 4,386 | $ 5,764 | |