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Note 11 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Federal income taxes at statutory rates | $ 93 | $ 4,861 | $ 5,445
State income taxes, net of federal benefit | 328 | 302 | 293
Tax benefit of stock option exercises | (1,087) | (1,576) | (751)
Section 199 manufacturing deduction | (381) | (304) | (440)
Research and development credit | (162) | (385) | (345)
Tax Cuts and Jobs Act | (59) |  |
Impairment of non-deductible goodwill | 4,257 |  |
Other | 274 | 215 | 184
Total income tax expense | $ 3,263 | $ 3,113 | $ 4,386

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- Definition Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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