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Note 5 - Goodwill and Intangible Assets (Details) (USD $)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of Intangible Assets $ 4,675,000us-gaap_AmortizationOfIntangibleAssets $ 2,979,000us-gaap_AmortizationOfIntangibleAssets $ 2,601,000us-gaap_AmortizationOfIntangibleAssets