Note 17 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 773,491	$ 640,093
Balance	966,587	773,491
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	135	(1,638)
Other comprehensive income (loss) before reclassifications	2,878	1,977
Amounts reclassified from accumulated other comprehensive income (loss)	(1,087)	(1)
Tax effect	(325)	(203)
Net current period other comprehensive income (loss)	1,466	1,773
Balance	1,601	135
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,611)	(3,905)
Other comprehensive income (loss) before reclassifications	14,150	(1,706)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Tax effect	0	0
Net current period other comprehensive income (loss)	14,150	(1,706)
Balance	8,539	(5,611)
AOCI Attributable to Parent [Member]
Balance	(5,476)	(5,543)
Other comprehensive income (loss) before reclassifications	17,028	271
Amounts reclassified from accumulated other comprehensive income (loss)	(1,087)	(1)
Tax effect	(325)	(203)
Net current period other comprehensive income (loss)	15,616	67
Balance	$ 10,140	$ (5,476)