Note 14 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018
Balance		$ 522,007
Balance	$ 579,020
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance	(2,524)	(1,364)
Other comprehensive income (loss) before reclassifications	94	(1,185)
Amounts reclassified from accumulated other comprehensive income	21	25
Net current period other comprehensive income (loss)	115	(1,160)
Balance	(2,409)	(2,524)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	7,566	3,177
Other comprehensive income (loss) before reclassifications	(6,862)	4,389
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive income (loss)	(6,862)	4,389
Balance	704	7,566
AOCI Attributable to Parent [Member]
Balance	5,042	1,813
Other comprehensive income (loss) before reclassifications	(6,768)	3,204
Amounts reclassified from accumulated other comprehensive income	21	25
Net current period other comprehensive income (loss)	(6,747)	3,229
Balance	$ (1,705)	$ 5,042