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Note 6 - 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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Balance $ 16,971 $ 17,203 $ 17,058 $ 16,776 $ 16,776
Credit loss expense (benefit) 1 635 [1] 369 [1] 1,704 [2] 792 [1]  
Recoveries of loans charged-off 351 3 356 10  
Loans charged-off (7) (13) (1,168) (16) (483)
Balance 17,950 17,562 17,950 17,562 17,058
Construction Real Estate [Member]          
Balance 481 413 482 408 408
Credit loss expense (benefit) 1 11 [1] 151 [1] 53 [2] 156 [1]  
Recoveries of loans charged-off 0 0 1 0  
Loans charged-off 0 0 (44) 0 0
Balance 492 564 492 564 482
Family Residential Real Estate 1-4 [Member]          
Balance 3,880 3,349 3,890 3,333 3,333
Credit loss expense (benefit) 1 226 [1] 400 [1] 218 [2] 414 [1]  
Recoveries of loans charged-off 0 1 0 3  
Loans charged-off 0 0 (2) 0 0
Balance 4,106 3,750 4,106 3,750 3,890
Multifamily [Member]          
Balance 2,221 2,584 2,188 2,542 2,542
Credit loss expense (benefit) 1 45 [1] (373) [1] 78 [2] (331) [1]  
Recoveries of loans charged-off 0 0 0 0  
Loans charged-off 0 0 0 0 0
Balance 2,266 2,211 2,266 2,211 2,188
Commercial Real Estate Portfolio Segment [Member]          
Balance 4,508 5,530 4,932 5,236 5,236
Credit loss expense (benefit) 1 747 [1] (521) [1] 323 [2] (227) [1]  
Recoveries of loans charged-off 0 0 0 0  
Loans charged-off 0 0 0 0 0
Balance 5,255 5,009 5,255 5,009 4,932
Agriculture Real Estate [Member]          
Balance 1,573 1,226 1,584 1,238 1,238
Credit loss expense (benefit) 1 (10) [1] 333 [1] (21) [2] 321 [1]  
Recoveries of loans charged-off 0 0 0 0  
Loans charged-off 0 0 0 0 0
Balance 1,563 1,559 1,563 1,559 1,584
Commercial Portfolio Segment [Member]          
Balance 1,888 1,912 1,759 1,955 1,955
Credit loss expense (benefit) 1 (147) [1] 413 [1] 1,093 [2] 371 [1]  
Recoveries of loans charged-off 351 2 354 4  
Loans charged-off (7) (4) (1,121) (7) (474)
Balance 2,085 2,323 2,085 2,323 1,759
Agriculture [Member]          
Balance 1,991 1,710 1,805 1,607 1,607
Credit loss expense (benefit) 1 (182) [1] 5 [1] 4 [2] 108 [1]  
Recoveries of loans charged-off 0 0 0 0  
Loans charged-off 0 0 0 0 0
Balance 1,809 1,715 1,809 1,715 1,805
Consumer and Other [Member]          
Balance 429 479 418 457 457
Credit loss expense (benefit) 1 (55) [1] (39) [1] (44) [2] (20) [1]  
Recoveries of loans charged-off 0 0 1 3  
Loans charged-off 0 (9) (1) (9) (9)
Balance $ 374 $ 431 $ 374 $ 431 $ 418
[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 $7 thousand related to off-balance sheet credit exposures.