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Note 1 - General (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Mar. 31, 2023
Jan. 01, 2023
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss $ 8,896 $ 8,896 $ 6,292 $ 7,446   $ 7,446 $ 5,710
Off-Balance-Sheet, Credit Loss, Liability           0  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss 131 131   0      
Retained Earnings (Accumulated Deficit) 95,988 95,988   90,284      
Financing Receivable, Credit Loss, Expense (Reversal)   166 $ 600 1,850      
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 786 786          
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss 593 593          
Accrued Interest Receivable [Member]              
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 3,100 3,100          
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss 593 593          
Accounting Standards Update 2016-13 [Member]              
Debt Securities, Held-to-Maturity, Allowance for Credit Loss 131 131     $ 132    
Financing Receivable, Credit Loss, Expense (Reversal) 12            
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss $ 786 $ 786          
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]              
Financing Receivable, Allowance for Credit Loss       2,186   2,186  
Off-Balance-Sheet, Credit Loss, Liability           153  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss       $ 134   132  
Retained Earnings (Accumulated Deficit)           $ (2,000)