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Note 4 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended 15 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Interest and Fee Income, Loans and Leases, Total $ 5,820,000 $ 5,767,000 $ 11,965,000 $ 11,821,000    
Number of Days Loans are Past Due to be on Non-accrual Status (Day)     90 days      
Financing Receivable, Modifications, Number of Contracts 0 0 0 0    
Maximum Number of Days Past Due on Contractual Payments for Borrower not Experiencing Financial Difficulty (Day)     30 days      
Financing Receivable, Prior Modifications, Number of Contracts, Returned to Full Payments           121
Financing Receivable, Prior Modifications, Aggregating Amount, Returned to Full Payment Status           $ 107,000,000
Commercial Portfolio Segment [Member]            
Increase (Decrease) in Finance Receivables     $ 24,100,000      
Financing Receivable, Number of Payment Deferrals 6   6     6
Financing Receivable, Deferred Payments $ 15,600,000   $ 15,600,000     $ 15,600,000
Commercial Portfolio Segment [Member] | Minimum [Member]            
Financing Receivable, Deferred Payments Period (Day)     90 days      
Commercial Portfolio Segment [Member] | Maximum [Member]            
Financing Receivable, Deferred Payments Period (Day)     180 days      
SBA CARES Act Paycheck Protection Program [Member]            
Financing Receivable Loans Originated Amount     $ 23,400,000   $ 56,300,000  
Loans and Leases Receivable, Gross, Total 28,000,000.0   $ 28,000,000.0   45,300,000 28,000,000.0
Loan Forgiveness Period (Week)     168 days      
Loans and Leases Receivable, Deferred Income, Total 948,000,000,000   $ 948,000,000,000   $ 2,200,000 $ 948,000,000,000
Interest and Fee Income, Loans and Leases, Total $ 390,000   $ 890,000 $ 0