Note 13 - Accumulated Other Comprehensive (Loss) - AOCI Reclass (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Other income (expense), net	$ (110)	$ 290	$ 1,291	$ (1,510)
Income before Income Tax Provision	7,144	6,174	19,210	16,599
Tax impact	(2,044)	(3,888)	(7,156)	(8,055)
Total reclassifications for the period	5,100	2,286	12,054	8,544
Reclassification out of Accumulated Other Comprehensive Income [Member]
Income before Income Tax Provision		(7)	50	(461)
Tax impact		3	(19)	185
Total reclassifications for the period		(4)	31	(276)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Other income (expense), net		(7)	201	(7)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]
Other income (expense), net			$ (151)	$ (454)