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Note 10 - Leasing Arrangements - Rental Income under Operating Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Total $ 2,173 $ 2,241 $ 4,388 $ 4,318
Operating Lease Income Including Water System Sales [Member]        
Minimum rentals 1,058 837 2,022 1,644
Percentage rentals 444 536 1,049 1,031
Licensing fees 36 295 69 518
Other 184 238 351 443
Total $ 1,722 $ 1,906 $ 3,491 $ 3,636