Note 11 - Accumulated Other Comprehensive (Loss) - AOCI Reclass (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other income (expense), net				$ 30
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other income (expense), net	$ (454)		$ (454)
Tax impact	182		182	$ (11)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Total reclassifications for the period	(272)		(272)	19
Other income (expense), net	(1,010)	$ 2,165	(1,800)	2,373
Tax impact	(2,505)	(3,235)	(4,167)	(4,784)
Total reclassifications for the period	$ 3,273	$ 5,747	$ 6,258	$ 9,322