Note 14 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Balance	$ 966,587
Balance	1,021,577
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	1,601
Other comprehensive loss before reclassifications	(754)
Amounts reclassified from accumulated other comprehensive income	(24)
Tax effect	124
Net current period other comprehensive loss	(654)
Balance	947
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	8,539
Other comprehensive loss before reclassifications	(2,474)
Amounts reclassified from accumulated other comprehensive income	0
Tax effect	0
Net current period other comprehensive loss	(2,474)
Balance	6,065
AOCI Attributable to Parent [Member]
Balance	10,140
Other comprehensive loss before reclassifications	(3,228)
Amounts reclassified from accumulated other comprehensive income	(24)
Tax effect	124
Net current period other comprehensive loss	(3,128)
Balance	$ 7,012