Note 6 - Select Balance Sheet and Statement of Operations Information - Warranty Accrual (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Balance as of the beginning of the period	$ 1,482	$ 1,753
Warranties issued during the period	195	993
Warranty costs incurred during the period	(341)	(1,264)
Balance at the end of the period	1,336	1,482
Current	945	1,074
Long-term	391	408
Total	$ 1,336	$ 1,482