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Note 10 - Income Taxes (Details) - Income Tax Reconciliation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Income Tax Reconciliation [Abstract]
Federal income taxes at statutory rates	$ 4,586	$ 4,543	$ 4,193
State income taxes, net of federal benefit	78	158	285
Tax benefit of stock option exercises	5	197	61
Section 199 manufacturing deduction	(250)	(357)	(347)
Research and development credit	(159)	(41)
Other	(157)	28	220
	$ 4,103	$ 4,528	$ 4,412

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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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