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Note 4 - Loans Receivable and Credit Disclosures - Activity in Allowance for Loan Losses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Balance, beginning $ 15,697,000 $ 16,621,000
Credit loss expense (benefit) 1 [1] 774,000 (874,000)
Recoveries of loans charged-off 32,000 42,000
Loans charged-off (245,000) (92,000)
Balance, ending 16,776,000 15,697,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance, beginning 518,000 0
Balance, ending   518,000
Construction Real Estate [Member]    
Balance, beginning 730,000 675,000
Credit loss expense (benefit) 1 73,000 55,000
Recoveries of loans charged-off 0 0
Loans charged-off 0 0
Balance, ending 408,000 730,000
Construction Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance, beginning (395,000)  
Balance, ending   (395,000)
Family Residential Real Estate 1-4 [Member]    
Balance, beginning 3,028,000 2,752,000
Credit loss expense (benefit) 1 58,000 291,000
Recoveries of loans charged-off 5,000 8,000
Loans charged-off 0 (23,000)
Balance, ending 3,333,000 3,028,000
Family Residential Real Estate 1-4 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance, beginning 242,000  
Balance, ending   242,000
Multifamily [Member]    
Balance, beginning 2,493,000 2,501,000
Credit loss expense (benefit) 1 73,000 (8,000)
Recoveries of loans charged-off 0 0
Loans charged-off 0 0
Balance, ending 2,542,000 2,493,000
Multifamily [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance, beginning (24,000)  
Balance, ending   (24,000)
Commercial Real Estate Portfolio Segment [Member]    
Balance, beginning 4,742,000 5,905,000
Credit loss expense (benefit) 1 (24,000) (1,166,000)
Recoveries of loans charged-off 5,000 3,000
Loans charged-off 0 0
Balance, ending 5,236,000 4,742,000
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance, beginning 513,000  
Balance, ending   513,000
Agriculture Real Estate [Member]    
Balance, beginning 1,625,000 1,584,000
Credit loss expense (benefit) 1 11,000 41,000
Recoveries of loans charged-off 0 0
Loans charged-off 0 0
Balance, ending 1,238,000 1,625,000
Agriculture Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance, beginning (398,000)  
Balance, ending   (398,000)
Commercial Portfolio Segment [Member]    
Balance, beginning 1,153,000 1,170,000
Credit loss expense (benefit) 1 381,000 20,000
Recoveries of loans charged-off 9,000 4,000
Loans charged-off (37,000) (41,000)
Balance, ending 1,955,000 1,153,000
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance, beginning 449,000  
Balance, ending   449,000
Agriculture [Member]    
Balance, beginning 1,705,000 1,836,000
Credit loss expense (benefit) 1 161,000 (124,000)
Recoveries of loans charged-off 5,000 0
Loans charged-off (203,000) (7,000)
Balance, ending 1,607,000 1,705,000
Agriculture [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance, beginning (61,000)  
Balance, ending   (61,000)
Consumer and Other [Member]    
Balance, beginning 221,000 198,000
Credit loss expense (benefit) 1 41,000 17,000
Recoveries of loans charged-off 8,000 27,000
Loans charged-off (5,000) (21,000)
Balance, ending 457,000 221,000
Consumer and Other [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance, beginning $ 192,000  
Balance, ending   $ 192,000
[1] The difference in the credit loss expense reported herein as compared to the Consolidated Statements of Income is associated with the credit loss expense of $15 thousand related to off-balance sheet credit exposures.