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Note 8 - Comprehensive Income (Details) - Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Comprehensive Income [Abstract]
Net income available for shareholders	$ 2,403us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,746us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 7,344us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 5,538us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Other comprehensive loss:
Foreign currency translation	(250)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax		(250)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Foreign currency translation	(250)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax		(250)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Other comprehensive loss	(250)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent		(250)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Other comprehensive loss	(250)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent		(250)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Total comprehensive income	$ 2,153us-gaap_ComprehensiveIncomeNetOfTax	$ 1,746us-gaap_ComprehensiveIncomeNetOfTax	$ 7,094us-gaap_ComprehensiveIncomeNetOfTax	$ 5,538us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount before tax of other comprehensive income (loss) attributable to parent entity.

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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