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Note 10 - Income Taxes (Details) - Provisions for Income Taxes (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Current tax provision
Federal	$ 4,186us-gaap_CurrentFederalTaxExpenseBenefit	$ 4,031us-gaap_CurrentFederalTaxExpenseBenefit	$ 4,440us-gaap_CurrentFederalTaxExpenseBenefit
State	1,135us-gaap_CurrentStateAndLocalTaxExpenseBenefit	106us-gaap_CurrentStateAndLocalTaxExpenseBenefit	280us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	212us-gaap_CurrentForeignTaxExpenseBenefit
	5,533us-gaap_CurrentIncomeTaxExpenseBenefit	4,137us-gaap_CurrentIncomeTaxExpenseBenefit	4,720us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax provision:
Federal	252us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(19)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(180)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State	51us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(15)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(12)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	(72)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
	231us-gaap_DeferredIncomeTaxExpenseBenefit	(34)us-gaap_DeferredIncomeTaxExpenseBenefit	(192)us-gaap_DeferredIncomeTaxExpenseBenefit
	$ 5,764us-gaap_IncomeTaxExpenseBenefit	$ 4,103us-gaap_IncomeTaxExpenseBenefit	$ 4,528us-gaap_IncomeTaxExpenseBenefit

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