Note 10 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Balance		$ 1,744,491		$ 1,744,491
Foreign currency translation adjustment	$ 1,689		$ (1,168)	1,921	$ (723)
Balance	1,868,170			1,868,170
AOCI Attributable to Parent [Member]
Balance	(3,898)	(4,130)		(4,130)
Foreign currency translation adjustment	1,689	232
Balance	$ (2,209)	$ (3,898)		$ (2,209)