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Note 11 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Federal income taxes at statutory rates	$ 4,861	$ 5,445	$ 5,374
State income taxes, net of federal benefit	302	293	860
Tax benefit of stock option exercises	(1,576)	(751)	209
Section 199 manufacturing deduction	(304)	(440)	(317)
Research and development credit	(385)	(345)	(248)
Other	215	184	(114)
	$ 3,113	$ 4,386	$ 5,764

X

- Definition

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

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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