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Note 8 - Fair Value Measurements (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
Provision for Loan and Lease Losses $ 200,000 $ 0 $ 375,000 $ 75,000  
Number of Foreclosed Real Estate Properties 0   0    
Impaired Loan [Member]          
Provision for Loan and Lease Losses $ 3,000 3,000 $ 4,000 12,000  
Foreclosed Real Estate [Member]          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount $ 0 $ 0 $ 0 $ 0  
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member]          
Fair Value Inputs, Estimated Selling Costs         10.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Minimum [Member]          
Fair Value Inputs, Estimated Selling Costs     10.00%    
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Maximum [Member]          
Fair Value Inputs, Estimated Selling Costs     23.00%    
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Weighted Average [Member]          
Fair Value Inputs, Estimated Selling Costs     11.00%    
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member]          
Fair Value Inputs, Estimated Selling Costs     65.00%