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Note 11 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	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

X

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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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