Note 11 - Accumulated Other Comprehensive (Loss) - AOCI Reclass (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Other income (expense), net	$ (515)	$ 815
Income before Income Tax Provision	7,241	5,271
Tax impact	(1,747)	(2,252)
Total reclassifications for the period	5,494	3,019
Reclassification out of Accumulated Other Comprehensive Income [Member]
Income before Income Tax Provision		(151)
Tax impact		61
Total reclassifications for the period		(90)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]
Other income (expense), net		$ (151)