Note 8 - Commitments and Contingencies - Changes in Warranty Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Balance	$ 19,726	$ 23,833	$ 24,082	$ 20,989
Warranties issued	580	475	942	475
Repairs, replacements and refunds	(1,581)	(139)	(2,253)	(1,519)
Changes in liability for pre-existing warranties	(1,071)	1,040	(5,117)	5,264
Balance	$ 17,654	$ 25,209	$ 17,654	$ 25,209