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Note 7 - Loans Receivable and Credit Disclosures - Activity in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Balance $ 17,203 $ 16,319 $ 16,776 $ 15,697 $ 15,697
Credit loss expense (benefit) 369 [1] (205) [2] 792 [1] 80 [3]  
Recoveries of loans charged-off 3 4 10 24  
Loans charged-off (13) 0 (16) (201) (245)
Balance 17,562 16,118 17,562 16,118 16,776
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Balance       518 518
Construction Real Estate [Member]          
Balance 413 412 408 730 730
Credit loss expense (benefit) 151 [1] 4 [2] 156 [1] 81 [3]  
Recoveries of loans charged-off 0 0 0 0  
Loans charged-off 0 0 0 0 0
Balance 564 416 564 416 408
Construction Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Balance       (395) (395)
Family Residential Real Estate 1-4 [Member]          
Balance 3,349 3,357 3,333 3,028 3,028
Credit loss expense (benefit) 400 [1] (100) [2] 414 [1] (15) [3]  
Recoveries of loans charged-off 1 1 3 3  
Loans charged-off 0 0 0 0 0
Balance 3,750 3,258 3,750 3,258 3,333
Family Residential Real Estate 1-4 [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Balance       242 242
Multifamily [Member]          
Balance 2,584 2,524 2,542 2,493 2,493
Credit loss expense (benefit) (373) [1] (29) [2] (331) [1] 26 [3]  
Recoveries of loans charged-off 0 0 0 0  
Loans charged-off 0 0 0 0 0
Balance 2,211 2,495 2,211 2,495 2,542
Multifamily [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Balance       (24) (24)
Commercial Real Estate Portfolio Segment [Member]          
Balance 5,530 5,033 5,236 4,742 4,742
Credit loss expense (benefit) (521) [1] (35) [2] (227) [1] (262) [3]  
Recoveries of loans charged-off 0 0 0 5  
Loans charged-off 0 0 0 0 0
Balance 5,009 4,998 5,009 4,998 5,236
Commercial Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Balance       513 513
Agriculture Real Estate [Member]          
Balance 1,226 1,214 1,238 1,625 1,625
Credit loss expense (benefit) 333 [1] 15 [2] 321 [1] 2 [3]  
Recoveries of loans charged-off 0 0 0 0  
Loans charged-off 0 0 0 0 0
Balance 1,559 1,229 1,559 1,229 1,238
Agriculture Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Balance       (398) (398)
Commercial Portfolio Segment [Member]          
Balance 1,912 2,014 1,955 1,153 1,153
Credit loss expense (benefit) 413 [1] (142) [2] 371 [1] 301 [3]  
Recoveries of loans charged-off 2 2 4 8  
Loans charged-off (4) 0 (7) (37) (37)
Balance 2,323 1,874 2,323 1,874 1,955
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Balance       449 449
Agriculture [Member]          
Balance 1,710 1,358 1,607 1,705 1,705
Credit loss expense (benefit) 5 [1] 40 [2] 108 [1] (82) [3]  
Recoveries of loans charged-off 0 0 0 0  
Loans charged-off 0 0 0 (164) (203)
Balance 1,715 1,398 1,715 1,398 1,607
Agriculture [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Balance       (61) (61)
Consumer and Other [Member]          
Balance 479 407 457 221 221
Credit loss expense (benefit) (39) [1] 42 [2] (20) [1] 29 [3]  
Recoveries of loans charged-off 0 1 3 8  
Loans charged-off (9) 0 (9) 0 (5)
Balance $ 431 $ 450 $ 431 450 457
Consumer and Other [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Balance       $ 192 $ 192
[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 $70 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 benefit of $69 thousand related to off-balance sheet credit exposures.
[3] 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 $46 thousand related to off-balance sheet credit exposures.