Note 5 - Revenues - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Balance at Beginning of Period	$ 1,110	$ 1,083	$ 567	$ 599
Balance at Beginning of Period			3,400
Unbilled Membership Dues	219	222	1,747	1,692
Billings	(484)	(492)	(1,469)	(1,478)
Balance at End of Period	845	813	845	813
Balance at End of Period	4,700		4,700
Deferred Membership Dues [Member]
Balance at Beginning of Period	5,863	5,737	3,443	3,643
Billings	609	674	6,842	6,448
Revenue Recognized	(1,801)	(1,793)	(5,614)	(5,473)
Balance at End of Period	4,671	4,618	4,671	4,618
Customer Advance Deposits [Member]
Balance at Beginning of Period	1,311	1,149	1,223	965
Billings	853	721	2,062	2,127
Revenue Recognized	(859)	(820)	(1,980)	(2,042)
Balance at End of Period	$ 1,305	$ 1,050	$ 1,305	$ 1,050