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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash Reserve Deposit Required and Made $ 0 $ 0  
Proceeds from Sale, Loan, Mortgage, Held-for-Sale 47,700,000 34,100,000 $ 46,100,000
Proceeds From Sale of SBA Loans 13,800,000 4,200,000 12,700,000
Gain (Loss) on Sale of Mortgage Loans 818,000 112,000 1,200,000
Gain (Loss) on Sales of Small Business Administration Loans 768,000 262,000 696,000
Equity Securities without Readily Determinable Fair Value, Amount 22,900,000 23,400,000  
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount 0 0  
The 401(k) Plan [Member]      
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 826,000 $ 707,000 $ 594,000
Premises [Member]      
Property, Plant and Equipment, Useful Life (Year) 30 years    
Leasehold Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life (Year) 3 years    
Leasehold Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life (Year) 10 years