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Note 14 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Federal income taxes at statutory rates	$ 483	$ 811	$ 1,811
State income taxes, net of federal benefit	(221)	1,122	208
Tax benefit of stock option exercises	(1,816)	(1,576)	(2,034)
Foreign-derived intangible income deduction	(999)	0	0
Research and development credit	(165)	(191)	(158)
Limitation for 162(m)	1,113	1,112	766
Foreign rate differential	810	657	0
Other	(176)	149	546
Total income tax (benefit) expense	$ (971)	$ 2,084	$ 1,139

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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 foreign-derived intangible income deduction.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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