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Note 1 - General (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Mar. 31, 2023
Jan. 01, 2023
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss $ 8,858,000 $ 8,858,000 $ 6,202,000 $ 7,446,000   $ 7,446,000 $ 5,710,000
Off-Balance-Sheet, Credit Loss, Liability           0  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss 144,000 144,000   0      
Retained Earnings (Accumulated Deficit) 93,805,000 93,805,000   90,284,000      
Financing Receivable, Credit Loss, Expense (Reversal)   45,000 $ 400,000 1,850,000      
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 789,000 789,000          
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss 584,000 584,000          
Accrued Interest Receivable [Member]              
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 4,200 4,200          
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss 584,000 584,000          
Accounting Standards Update 2016-13 [Member]              
Debt Securities, Held-to-Maturity, Allowance for Credit Loss 144,000 144,000     $ 132,000    
Financing Receivable, Credit Loss, Expense (Reversal) 12,000            
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss $ 789,000 $ 789,000          
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]              
Financing Receivable, Allowance for Credit Loss       2,186,000   2,186,000  
Off-Balance-Sheet, Credit Loss, Liability           153,000  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss       $ 134,000   132,000  
Retained Earnings (Accumulated Deficit)           $ (2,000,000.0)