Note 14 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Balance			$ 522,007
Balance	$ 610,164
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance	(2,409)	$ (2,524)	(1,364)
Other comprehensive income (loss) before reclassifications	242	94	(1,185)
Amounts reclassified from accumulated other comprehensive income (loss)	8	21	25
Tax effect	241
Net current period other comprehensive income (loss)	491	115	(1,160)
Balance	(1,918)	(2,409)	(2,524)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	704	7,566	3,177
Other comprehensive income (loss) before reclassifications	(4,526)	(6,862)	4,389
Amounts reclassified from accumulated other comprehensive income (loss)
Tax effect
Net current period other comprehensive income (loss)	(4,526)	(6,862)	4,389
Balance	(3,822)	704	7,566
AOCI Attributable to Parent [Member]
Balance	(1,705)	5,042	1,813
Other comprehensive income (loss) before reclassifications	(4,284)	(6,768)	3,204
Amounts reclassified from accumulated other comprehensive income (loss)	8	21	25
Tax effect	241
Net current period other comprehensive income (loss)	(4,035)	(6,747)	3,229
Balance	$ (5,740)	$ (1,705)	$ 5,042