Note 12 - Accumulated Other Comprehensive (Loss) - AOCI Reclass (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Other income (expense), net	$ (7)		$ (7)	$ 30
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]
Other income (expense), net		$ (945)	(454)	(945)
Tax impact	$ 3	331	185	320
Reclassification out of Accumulated Other Comprehensive Income [Member]
Total reclassifications for the period	(4)	(614)	(276)	(595)
Other income (expense), net	290	108	(1,510)	2,481
Tax impact	(3,888)	(767)	(8,055)	(5,551)
Total reclassifications for the period	$ 2,286	$ 6,622	$ 8,544	$ 15,944