Note 14 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Balance	$ 1,087,355		$ 966,587
Balance	1,162,713	$ 1,087,355
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	799	947	1,601
Other comprehensive income (loss) before reclassifications	(287)	(169)	(754)
Amounts reclassified from accumulated other comprehensive income	(13)		(24)
Tax effect	32	21	124
Net current period other comprehensive loss	(268)	(148)	(654)
Balance	531	799	947
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	11,502	6,065	8,539
Other comprehensive income (loss) before reclassifications	(371)	5,437	(2,474)
Amounts reclassified from accumulated other comprehensive income	0		0
Tax effect	0	0	0
Net current period other comprehensive loss	(371)	5,437	(2,474)
Balance	11,131	11,502	6,065
AOCI Attributable to Parent [Member]
Balance	12,301	7,012	10,140
Other comprehensive income (loss) before reclassifications	(658)	5,268	(3,228)
Amounts reclassified from accumulated other comprehensive income	(13)		(24)
Tax effect	32	21	124
Net current period other comprehensive loss	(639)	5,289	(3,128)
Balance	$ 11,662	$ 12,301	$ 7,012