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Note 1 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended
Jan. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Number of Bank Branches   27    
Number of Operating Segments   2    
Earnings Per Share, Basic (in dollars per share) | $ / shares   $ 4.63 $ 3.75 $ 4.48
Earnings Per Share, Diluted (in dollars per share) | $ / shares   $ 4.56 $ 3.7 $ 4.37
Cash, Uninsured Amount   $ 27,000 $ 281,000  
Federal Home Loan Bank Stock   2,114,000 10,611,000  
FHLB Impairment   0 0 $ 0
Marketing and Advertising Expense   1,349,000 897,000 634,000
Goodwill, Impairment Loss   $ 0 0 $ 0
Maximum [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)   10 years    
Minimum [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)   7 years    
Building and Building Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life (Year)   25 years    
Furniture Fixtures and Equipment [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life (Year)   10 years    
Furniture Fixtures and Equipment [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life (Year)   3 years    
Previously Reported [Member]        
Earnings Per Share, Basic (in dollars per share) | $ / shares       $ 4.42
Earnings Per Share, Diluted (in dollars per share) | $ / shares       $ 4.32
Mortgage Servicing Rights [Member]        
Servicing Asset   $ 9,090,000 $ 18,017,000  
Subsequent Event [Member] | Mortgage Servicing Rights [Member]        
Servicing Asset $ 1,290,000,000      
Servicing Asset at Fair Value, Disposals 16,600,000      
Servicing Asset at Amortized Cost, Disposals $ 8,100,000      
Servicing Assets Sold, Percent of Portfolio 45.60%