Note 5 - Revenues - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Balance	$ 1,145	$ 1,102	$ 578	$ 585
Balance			3,400
Unbilled	252	237	1,857	1,802
Billings	519	500	1,557	1,548
Billings	(519)	(500)	(1,557)	(1,548)
Balance	878	839	878	839
Balance	4,600		4,600
Deferred Membership Dues [Member]
Balance	5,782	5,376	3,363	3,196
Billings	650	730	6,577	6,178
Billings	(650)	(730)	(6,577)	(6,178)
Revenue recognized	(1,783)	(1,684)	(5,291)	(4,952)
Balance	4,649	4,422	4,649	4,422
Revenue recognized	1,783	1,684	5,291	4,952
Customer Advance Deposits [Member]
Balance	992	784	795	674
Billings	785	588	2,088	1,299
Billings	(785)	(588)	(2,088)	(1,299)
Revenue recognized	(773)	(688)	(1,879)	(1,289)
Balance	1,004	684	1,004	684
Revenue recognized	$ 773	$ 688	$ 1,879	$ 1,289