Note 4 - Fair Value (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other than Temporary Impairment Losses, Investments	$ 454	$ 1,900
Auction Rate Preferred Securities Percentage Collateralized	100.00%
Collateralized Asset Value Exceeding Value of ARPS Percentage	200.00%
Debt, Long-term and Short-term, Combined Amount	$ 87,100	$ 49,200