Note 11 - Leasing Arrangements - Rental Income under Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Minimum rentals	$ 837	$ 818	$ 1,644	$ 1,640
Percentage rentals	536	578	1,031	971
Licensing fees	295	275	518	498
Other	238	264	443	603
Total	2,241	2,198	4,318	4,228
Operating Lease Income Including Water System Sales [Member]
Total	$ 1,906	$ 1,935	$ 3,636	$ 3,712