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Note 11 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Federal income taxes at statutory rates	$ 1,811	$ 93	$ 4,861
State income taxes, net of federal benefit	208	328	302
Tax benefit of stock option exercises	(2,034)	(1,087)	(1,576)
Section 199 manufacturing deduction		(381)	(304)
Research and development credit	(158)	(162)	(385)
Tax Cuts and Jobs Act		(59)
Impairment of non-deductible goodwill	284	4,257
Limitation for 162 (m)	766
Other	262	274	215
Total income tax expense	$ 1,139	$ 3,263	$ 3,113

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the limitation for 162(m).

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