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Note 7 - Loans Receivable and Credit Disclosures - Activity in Allowance for Loan Losses (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Balance, beginning $ 16,776,000 $ 15,697,000 $ 15,697,000
Credit loss expense (benefit) 172,000 [1] 212,000 [2]  
Recoveries of loans charged-off 4,000 10,000  
Loans charged-off 0 (168,000) (245,000)
Balance, ending 16,952,000 16,269,000 16,776,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance, beginning   518,000 518,000
Construction Real Estate [Member]      
Balance, beginning 408,000 730,000 730,000
Credit loss expense (benefit) 45,000 [1] 56,000 [2]  
Recoveries of loans charged-off 0 0  
Loans charged-off 0 0 0
Balance, ending 453,000 391,000 408,000
Construction Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance, beginning   (395,000) (395,000)
Family Residential Real Estate 1-4 [Member]      
Balance, beginning 3,333,000 3,028,000 3,028,000
Credit loss expense (benefit) (25,000) [1] 17,000 [2]  
Recoveries of loans charged-off 1,000 1,000  
Loans charged-off 0 0 0
Balance, ending 3,309,000 3,288,000 3,333,000
Family Residential Real Estate 1-4 [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance, beginning   242,000 242,000
Multifamily [Member]      
Balance, beginning 2,542,000 2,493,000 2,493,000
Credit loss expense (benefit) (5,000) [1] 99,000 [2]  
Recoveries of loans charged-off 0 0  
Loans charged-off 0 0 0
Balance, ending 2,537,000 2,568,000 2,542,000
Multifamily [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance, beginning   (24,000) (24,000)
Commercial Real Estate Portfolio Segment [Member]      
Balance, beginning 5,236,000 4,742,000 4,742,000
Credit loss expense (benefit) 258,000 [1] (54,000) [2]  
Recoveries of loans charged-off 0 5,000  
Loans charged-off 0 0 0
Balance, ending 5,494,000 5,206,000 5,236,000
Commercial Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance, beginning   513,000 513,000
Agriculture Real Estate [Member]      
Balance, beginning 1,238,000 1,625,000 1,625,000
Credit loss expense (benefit) (17,000) [1] (9,000) [2]  
Recoveries of loans charged-off 0 0  
Loans charged-off 0 0 0
Balance, ending 1,221,000 1,218,000 1,238,000
Agriculture Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance, beginning   (398,000) (398,000)
Commercial Portfolio Segment [Member]      
Balance, beginning 1,955,000 1,153,000 1,153,000
Credit loss expense (benefit) (43,000) [1] 183,000 [2]  
Recoveries of loans charged-off 1,000 3,000  
Loans charged-off 0 (4,000) (37,000)
Balance, ending 1,913,000 1,784,000 1,955,000
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance, beginning   449,000 449,000
Agriculture [Member]      
Balance, beginning 1,607,000 1,705,000 1,705,000
Credit loss expense (benefit) (19,000) [1] (88,000) [2]  
Recoveries of loans charged-off 0 0  
Loans charged-off 0 (164,000) (203,000)
Balance, ending 1,588,000 1,392,000 1,607,000
Agriculture [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance, beginning   (61,000) (61,000)
Consumer and Other [Member]      
Balance, beginning 457,000 221,000 221,000
Credit loss expense (benefit) (22,000) [1] 8,000 [2]  
Recoveries of loans charged-off 2,000 1,000  
Loans charged-off 0 0 (5,000)
Balance, ending $ 437,000 422,000 457,000
Consumer and Other [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance, beginning   $ 192,000 $ 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 benefit of $3 thousand related to off-balance sheet credit exposures.
[2] 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 $63 thousand related to off-balance sheet credit exposures.