Note 5 - Revenues - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Balance at Beginning of Period	$ 582	$ 567
Balance at Beginning of Period	3,500
Unbilled Membership Dues	614	670
Billings	(463)	(447)
Balance at End of Period	733	790
Balance at End of Period	5,100
Deferred Membership Dues [Member]
Balance at Beginning of Period	3,524	3,443
Billings	3,443	3,689
Revenue Recognized	(1,833)	(1,974)
Balance at End of Period	5,134	5,158
Customer Advance Deposits [Member]
Balance at Beginning of Period	1,565	1,223
Billings	505	483
Revenue Recognized	(423)	(395)
Balance at End of Period	$ 1,647	$ 1,311