Note 14 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022
Balance	$ 1,326,112	$ 1,243,985
Balance	1,423,122	1,326,112
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(6,463)	(1,063)
Other comprehensive loss before reclassifications	(1,582)	(5,970)
Amounts reclassified from accumulated other comprehensive income	9	5
Tax effect	170	565
Net current period other comprehensive loss	(1,403)	(5,400)
Balance	(7,866)	(6,463)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	16,765	16,943
Other comprehensive loss before reclassifications	(23,585)	(178)
Amounts reclassified from accumulated other comprehensive income	0	0
Tax effect	0	0
Net current period other comprehensive loss	(23,585)	(178)
Balance	(6,820)	16,765
AOCI Attributable to Parent [Member]
Balance	10,302	15,880
Other comprehensive loss before reclassifications	(25,167)	(6,148)
Amounts reclassified from accumulated other comprehensive income	9	5
Tax effect	170	565
Net current period other comprehensive loss	(24,988)	(5,578)
Balance	$ (14,686)	$ 10,302