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Note 12 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Federal income taxes at statutory rates	$ (82)	$ 751	$ 483
State income taxes, net of federal benefit	(1,075)	628	(221)
Tax benefit of stock option exercises	(1,169)	(4,055)	(1,816)
Research and development credit	(1,010)	(495)	(165)
Limitation for 162(m)	2,675	4,039	1,113
Return to provision adjustment	(125)	(68)	(172)
Subpart F, GILTI, & FDII	(127)	6	(999)
Foreign rate differential	(439)	152	810
Permanent Difference	33	64	15
Interest reserve adjustment	0	668
Other	0	13	(19)
Total income tax (benefit) expense	$ (1,319)	$ 1,703	$ (971)

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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 interest reserve adjustment.

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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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