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Note 10 - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Federal income taxes at statutory rates	$ 5,445	$ 5,374	$ 4,586
State income taxes, net of federal benefit	293	860	78
Tax benefit of stock option exercises	(751)	209	5
Section 199 manufacturing deduction	(440)	(317)	(250)
Research and development credit	(345)	(248)	(159)
Other	184	(114)	(157)
	$ 4,386	$ 5,764	$ 4,103

X

- Definition

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

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