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Note 3 - Loans and Allowance for Credit Losses - Financial Effect by Type of Modification (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Modified in period   $ 308,000   $ 7,093,000
Commercial Portfolio Segment [Member]        
Modified in period   19,000   6,593,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]        
Modified in period   19,000   6,593,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]        
Modified in period   0   0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]        
Modified in period   0   0
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]        
Modified in period   0   0
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]        
Modified in period   0   0
Retail Portfolio Segment [Member]        
Modified in period   289,000   500,000
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]        
Modified in period   $ 0   $ 0
Contractual Interest Rate Reduction [Member]        
Modified in period $ 0   $ 0  
Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member]        
Modified in period 0   0  
Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]        
Modified in period 0   0  
Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]        
Modified in period 0   0  
Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]        
Modified in period 0   0  
Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]        
Modified in period 0   0  
Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]        
Modified in period 0   0  
Contractual Interest Rate Reduction [Member] | Retail Portfolio Segment [Member]        
Modified in period 0   0  
Contractual Interest Rate Reduction [Member] | Retail Portfolio Segment [Member] | Loans Categorized as 1-4 Family Mortgages [Member]        
Modified in period 0   0  
Contractual Interest Rate Reduction [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member]        
Modified in period 0   0  
Extended Maturity [Member]        
Modified in period 0   8,184,000  
Extended Maturity [Member] | Commercial Portfolio Segment [Member]        
Modified in period 0   8,184,000  
Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]        
Modified in period 0   8,184,000  
Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]        
Modified in period 0   0  
Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]        
Modified in period 0   0  
Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]        
Modified in period 0   0  
Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]        
Modified in period 0   0  
Extended Maturity [Member] | Retail Portfolio Segment [Member]        
Modified in period 0   0  
Extended Maturity [Member] | Retail Portfolio Segment [Member] | Loans Categorized as 1-4 Family Mortgages [Member]        
Modified in period 0   0  
Extended Maturity [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member]        
Modified in period 0   0  
Principal Forgiveness [Member]        
Modified in period 0   0  
Principal Forgiveness [Member] | Commercial Portfolio Segment [Member]        
Modified in period 0   0  
Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]        
Modified in period 0   0  
Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]        
Modified in period 0   0  
Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]        
Modified in period 0   0  
Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]        
Modified in period 0   0  
Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]        
Modified in period 0   0  
Principal Forgiveness [Member] | Retail Portfolio Segment [Member]        
Modified in period 0   0  
Principal Forgiveness [Member] | Retail Portfolio Segment [Member] | Loans Categorized as 1-4 Family Mortgages [Member]        
Modified in period 0   0  
Principal Forgiveness [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member]        
Modified in period $ 0   $ 0