Note 17 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 966,587	$ 773,491
Balance	1,243,985	966,587
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	1,601	135
Other comprehensive income (loss) before reclassifications	(3,244)	2,878
Amounts reclassified from accumulated other comprehensive income	(33)	(1,087)
Tax effect	613	(325)
Net current period other comprehensive income (loss)	(2,664)	1,466
Balance	(1,063)	1,601
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	8,539	(5,611)
Other comprehensive income (loss) before reclassifications	8,404	14,150
Amounts reclassified from accumulated other comprehensive income	0	0
Tax effect	0	0
Net current period other comprehensive income (loss)	8,404	14,150
Balance	16,943	8,539
AOCI Attributable to Parent [Member]
Balance	10,140	(5,476)
Other comprehensive income (loss) before reclassifications	5,160	17,028
Amounts reclassified from accumulated other comprehensive income	(33)	(1,087)
Tax effect	613	(325)
Net current period other comprehensive income (loss)	5,740	15,616
Balance	$ 15,880	$ 10,140