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Note 7 - Stock Compensation (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Phantom Share Units (PSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 48,762  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Value, Payable Requisite Employee Age (Year) 65 years  
Deferred Compensation Arrangement with Individual, Recorded Liability $ 0  
Share-Based Payment Arrangement, Option [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 5 years  
Share-Based Payment Arrangement, Expense $ 0 $ 0