Note 5 - Allowance for Doubtful Accounts - Activity in Accounts Receivable Allowance from Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance at beginning of period	$ 17	$ 47
Bad debt expense	127	0
Write-offs	(47)	0
Other adjustments	2	(30)
Balance at end of period	$ 99	$ 17