Note 1 - Organization and Significant Accounting Policies - Excess and Obsolete Inventory Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Excess and obsolete inventory reserve, beginning balance	$ 927	$ 927
Provision charged to expense	(56)	0
Write-offs / Recoveries	(258)	0
Excess and obsolete inventory reserve, ending balance	$ 613	$ 927