Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance	$ 65	$ 94	$ 120
Bad debt expense	99	19	38
Write-offs	99	50	76
Recoveries	10	2	12
Balance	$ 75	$ 65	$ 94