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Note 3 - Related Party Transactions - Related Party Balances (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Due to franchisees $ 10,990   $ 10,990   $ 9,846
Worlds Franchisees [Member]          
Franchisee royalties 2,414 $ 2,177 7,300 $ 6,442  
Due to franchisees 1,110   1,110   1,468
Risk management incentive program liability $ 401   $ 401   $ 446