Note 1 - Organization and Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance at January 1	$ 110	$ 223
Provision charged to expense	24	(19)
Write-offs / Recoveries	(23)	(94)
Balance at December 31	$ 111	$ 110