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Note 14 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Federal income taxes at statutory rates	$ 721	$ 1,811	$ 93
State income taxes, net of federal benefit	1,147	208	328
Tax benefit of stock option exercises	(1,576)	(2,034)	(1,087)
Section 199 manufacturing deduction			(381)
Research and development credit	(191)	(158)	(162)
Tax Cuts and Jobs Act			(59)
Impairment of non-deductible goodwill		284	4,257
Limitation for 162(m)	1,112	766
Foreign rate differential	657
Other	214	262	274
Total income tax expense	$ 2,084	$ 1,139	$ 3,263

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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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