Note 6 - Select Balance Sheet and Statement of Operations Information - Warranty Accrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Balance as of the beginning of the period	$ 1,363	$ 1,482
Warranties issued during the period	109	933
Warranty costs incurred during the period	(97)	(1,052)
Balance at the end of the period	1,375	1,363
Current	1,107	1,029	$ 1,029
Long-term	268	334	334
Total	$ 1,375	$ 1,363	$ 1,363