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