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Note 4 - Income Taxes (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Tax Expense (Benefit), Total $ 1,259,000 $ 186,000 $ 2,675,000 $ 2,033,000
Effective Income Tax Rate Reconciliation, Percent, Total     22.00% 25.00%
Income Tax Expense (Benefit), Discrete Adjustments     $ (16,000)  
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount     300,000  
Effective Income Tax Rate Reconciliation, Change in Fair Value of Noncontrolling Interest, Amount     900,000  
Effective Income Tax Rate Reconciliation, Change in Estimated Tax Credits, Amount     100,000  
Effective Income Tax Rate Reconciliation, Uncertain Tax Positions, Amount     300,000  
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount     $ 100,000  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount       $ 200,000