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Note 10 - Income Taxes (Details) - Income Tax Reconciliation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Reconciliation [Abstract]
Federal income taxes at statutory rates	$ 5,374us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 4,586us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 4,543us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit	860us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	78us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	158us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Tax benefit of stock option exercises	209us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	5us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	197us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Section 199 manufacturing deduction	(317)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(250)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(357)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Research and development credit	(248)us-gaap_IncomeTaxReconciliationTaxCreditsResearch	(159)us-gaap_IncomeTaxReconciliationTaxCreditsResearch	(41)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Other	(114)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(157)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	28us-gaap_IncomeTaxReconciliationOtherReconcilingItems
	$ 5,764us-gaap_IncomeTaxExpenseBenefit	$ 4,103us-gaap_IncomeTaxExpenseBenefit	$ 4,528us-gaap_IncomeTaxExpenseBenefit

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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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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