Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Balance	$ 65	$ 94
Bad debt expense	100	6
Write-offs	89	37
Recoveries	9	2
Balance	$ 85	$ 65