Note 14 - Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Balance	$ 773,491
Balance	813,190
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	135
Other comprehensive income (loss) before reclassifications	(1,680)
Amounts reclassified from accumulated other comprehensive income (loss)	(28)
Tax effect	55
Net current period other comprehensive income (loss)	(1,653)
Balance	(1,518)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,611)
Other comprehensive income (loss) before reclassifications	(2,882)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Tax effect	0
Net current period other comprehensive income (loss)	(2,882)
Balance	(8,493)
AOCI Attributable to Parent [Member]
Balance	(5,476)
Other comprehensive income (loss) before reclassifications	(4,562)
Amounts reclassified from accumulated other comprehensive income (loss)	(28)
Tax effect	55
Net current period other comprehensive income (loss)	(4,535)
Balance	$ (10,011)