Note 6 - Select Balance Sheet and Statement of Operations Information - Warranty Accrual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance as of the beginning of the year	$ 1,482	$ 1,753
Warranties issued during the year	933	993
Warranty costs incurred during the year	(1,052)	(1,264)
Balance at the end of the year	1,363	1,482
Current	1,029	1,074
Long-term	334	408
Total	$ 1,363	$ 1,482