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Note 4 - Loans and the Allowance for Credit Losses - Loan Portfolio Allocated by Internal Risk Ratings (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
Loans, Year One $ 113,870   $ 113,870   $ 141,749
Loans, Year Two 181,960   181,960   158,667
Loans, Year Three 208,723   208,723   206,399
Loans, Year Four 256,949   256,949   123,605
Loans, Year Five 188,606   188,606   100,390
Loans, Prior 415,787   415,787   208,524
Loans, Revolving 131,687   131,687   75,475
Loans, Revolving Converted to Term 2,397   2,397   3,762
Loans, Total 1,499,979   1,499,979   1,018,571
Loans, Year One, Write-offs     0   0
Loans, Year Two, Write-offs     150   484
Loans, Year Three, Write-offs     149   676
Loans, Year Four, Write-offs     250   293
Loans, Year Five, Write-offs     27   177
Loans, Prior, Write-offs     110   257
Loans, Revolving, Write-offs     44   152
Loans, Total, Write-offs     730   2,039
Loans, Revolving Converted to Term, Write-offs     0   0
Performing Financial Instruments [Member]          
Loans, Year One 5,117   5,117   2,433
Loans, Year Two 7,032   7,032   24,408
Loans, Year Three 20,186   20,186   23,160
Loans, Year Four 19,881   19,881   10,744
Loans, Year Five 6,677   6,677   4,867
Loans, Prior 4,283   4,283   4,068
Loans, Revolving 463   463   157
Loans, Revolving Converted to Term 0   0   0
Loans, Total 63,639   63,639   69,837
Nonperforming Financial Instruments [Member]          
Loans, Year One 0   0   0
Loans, Year Two 4   4   195
Loans, Year Three 205   205   265
Loans, Year Four 203   203   190
Loans, Year Five 258   258   131
Loans, Prior 165   165   88
Loans, Revolving 0   0   2
Loans, Revolving Converted to Term 0   0   0
Loans, Total 835   835   871
Commercial Portfolio Segment [Member] | Commercial Loans [Member]          
Loans, Year One 13,876   13,876   19,946
Loans, Year Two 27,143   27,143   12,886
Loans, Year Three 24,241   24,241   13,249
Loans, Year Four 28,097   28,097   9,214
Loans, Year Five 13,883   13,883   2,127
Loans, Prior 16,044   16,044   6,952
Loans, Revolving 39,213   39,213   13,820
Loans, Revolving Converted to Term 0   0   0
Loans, Total 162,497   162,497   78,194
Loans, Year One, Write-offs     0   0
Loans, Year Two, Write-offs     114   86
Loans, Year Three, Write-offs     0   43
Loans, Year Four, Write-offs     51   0
Loans, Year Five, Write-offs     0   0
Loans, Prior, Write-offs     0   22
Loans, Revolving, Write-offs     25   151
Loans, Total, Write-offs 25 $ (0) 190 $ 65 302
Loans, Revolving Converted to Term, Write-offs         0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member]          
Loans, Year One 13,873   13,873   19,885
Loans, Year Two 27,143   27,143   12,642
Loans, Year Three 24,011   24,011   12,042
Loans, Year Four 27,998   27,998   8,405
Loans, Year Five 12,811   12,811   1,658
Loans, Prior 15,126   15,126   6,886
Loans, Revolving 38,605   38,605   13,232
Loans, Revolving Converted to Term 0   0   0
Loans, Total 159,567   159,567   74,750
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Special Mention [Member]          
Loans, Year One 0   0   0
Loans, Year Two 0   0   0
Loans, Year Three 0   0   157
Loans, Year Four 0   0   444
Loans, Year Five 939   939   0
Loans, Prior 638   638   36
Loans, Revolving 443   443   513
Loans, Revolving Converted to Term 0   0   0
Loans, Total 2,020   2,020   1,150
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member]          
Loans, Year One 3   3   61
Loans, Year Two 0   0   244
Loans, Year Three 230   230   1,050
Loans, Year Four 99   99   365
Loans, Year Five 133   133   469
Loans, Prior 280   280   30
Loans, Revolving 165   165   75
Loans, Revolving Converted to Term 0   0   0
Loans, Total 910   910   2,294
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]          
Loans, Year One 9,354   9,354   6,939
Loans, Year Two 6,910   6,910   12,094
Loans, Year Three 19,413   19,413   20,055
Loans, Year Four 24,304   24,304   14,999
Loans, Year Five 18,047   18,047   15,637
Loans, Prior 43,823   43,823   30,995
Loans, Revolving 32,515   32,515   18,391
Loans, Revolving Converted to Term 0   0   0
Loans, Total 154,366   154,366   119,110
Loans, Year One, Write-offs     0   0
Loans, Year Two, Write-offs     0   0
Loans, Year Three, Write-offs     11   0
Loans, Year Four, Write-offs     0   0
Loans, Year Five, Write-offs     0   0
Loans, Prior, Write-offs     0   0
Loans, Revolving, Write-offs     0   0
Loans, Total, Write-offs (0) (0) 11 (0) 0
Loans, Revolving Converted to Term, Write-offs     0   0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Pass [Member]          
Loans, Year One 7,820   7,820   6,421
Loans, Year Two 6,910   6,910   9,331
Loans, Year Three 16,167   16,167   14,290
Loans, Year Four 12,000   12,000   11,389
Loans, Year Five 14,182   14,182   14,252
Loans, Prior 35,902   35,902   28,075
Loans, Revolving 26,064   26,064   13,356
Loans, Revolving Converted to Term 0   0   0
Loans, Total 119,045   119,045   97,114
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Special Mention [Member]          
Loans, Year One 1,114   1,114   518
Loans, Year Two 0   0   53
Loans, Year Three 499   499   1,159
Loans, Year Four 7,129   7,129   358
Loans, Year Five 806   806   1,307
Loans, Prior 6,591   6,591   1,639
Loans, Revolving 3,273   3,273   534
Loans, Revolving Converted to Term 0   0   0
Loans, Total 19,412   19,412   5,568
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Substandard [Member]          
Loans, Year One 420   420   0
Loans, Year Two 0   0   2,710
Loans, Year Three 2,747   2,747   4,606
Loans, Year Four 5,175   5,175   3,252
Loans, Year Five 3,059   3,059   78
Loans, Prior 1,330   1,330   1,281
Loans, Revolving 3,178   3,178   4,501
Loans, Revolving Converted to Term 0   0   0
Loans, Total 15,909   15,909   16,428
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]          
Loans, Year One 75,395   75,395   90,579
Loans, Year Two 117,536   117,536   92,735
Loans, Year Three 134,415   134,415   138,406
Loans, Year Four 171,398   171,398   82,627
Loans, Year Five 138,515   138,515   74,326
Loans, Prior 340,557   340,557   160,686
Loans, Revolving 3,869   3,869   7,592
Loans, Revolving Converted to Term 0   0   0
Loans, Total 981,685   981,685   646,951
Loans, Year One, Write-offs     0   0
Loans, Year Two, Write-offs     0   0
Loans, Year Three, Write-offs     0   0
Loans, Year Four, Write-offs     0   0
Loans, Year Five, Write-offs     0   0
Loans, Prior, Write-offs     0   0
Loans, Revolving, Write-offs     0   0
Loans, Total, Write-offs (0) (0) 0 (0) 0
Loans, Revolving Converted to Term, Write-offs     0   0
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Pass [Member]          
Loans, Year One 74,401   74,401   90,579
Loans, Year Two 117,536   117,536   92,735
Loans, Year Three 134,415   134,415   137,607
Loans, Year Four 170,782   170,782   82,627
Loans, Year Five 137,156   137,156   73,405
Loans, Prior 330,501   330,501   154,466
Loans, Revolving 3,869   3,869   7,142
Loans, Revolving Converted to Term 0   0   0
Loans, Total 968,660   968,660   638,561
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Special Mention [Member]          
Loans, Year One 994   994   0
Loans, Year Two 0   0   0
Loans, Year Three 0   0   210
Loans, Year Four 238   238   0
Loans, Year Five 950   950   0
Loans, Prior 3,015   3,015   0
Loans, Revolving 0   0   0
Loans, Revolving Converted to Term 0   0   0
Loans, Total 5,197   5,197   210
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Substandard [Member]          
Loans, Year One 0   0   0
Loans, Year Two 0   0   0
Loans, Year Three 0   0   628
Loans, Year Four 378   378   0
Loans, Year Five 409   409   921
Loans, Prior 7,041   7,041   1,760
Loans, Revolving 0   0   0
Loans, Revolving Converted to Term 0   0   0
Loans, Total 7,828   7,828   3,309
Commercial Portfolio Segment [Member] | Construction Loans [Member]          
Loans, Year One 8,095   8,095   21,220
Loans, Year Two 18,853   18,853   15,244
Loans, Year Three 8,441   8,441   11,264
Loans, Year Four 3,582   3,582   3,767
Loans, Year Five 5,235   5,235   947
Loans, Prior 1,092   1,092   843
Loans, Revolving 3,757   3,757   0
Loans, Revolving Converted to Term 0   0   0
Loans, Total 49,055   49,055   53,285
Loans, Year One, Write-offs     0   0
Loans, Year Two, Write-offs     0   0
Loans, Year Three, Write-offs     0   0
Loans, Year Four, Write-offs     0   0
Loans, Year Five, Write-offs     0   0
Loans, Prior, Write-offs     0   0
Loans, Revolving, Write-offs     0   0
Loans, Total, Write-offs (0) (0) 0 (0) 0
Loans, Revolving Converted to Term, Write-offs     0   0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]          
Loans, Year One 8,095   8,095   21,110
Loans, Year Two 18,853   18,853   15,244
Loans, Year Three 4,134   4,134   11,054
Loans, Year Four 3,582   3,582   3,767
Loans, Year Five 5,235   5,235   947
Loans, Prior 1,092   1,092   843
Loans, Revolving 3,757   3,757   0
Loans, Revolving Converted to Term 0   0   0
Loans, Total 44,748   44,748   52,965
Residential Portfolio Segment [Member] | Real Estate Loan [Member]          
Loans, Year One 2,033   2,033   632
Loans, Year Two 4,482   4,482   1,105
Loans, Year Three 1,822   1,822   0
Loans, Year Four 9,381   9,381   2,064
Loans, Year Five 5,991   5,991   2,355
Loans, Prior 9,823   9,823   4,892
Loans, Revolving 156   156   520
Loans, Revolving Converted to Term 0   0   0
Loans, Total 33,688   33,688   11,568
Loans, Year One, Write-offs     0   0
Loans, Year Two, Write-offs     0   0
Loans, Year Three, Write-offs     0   0
Loans, Year Four, Write-offs     0   0
Loans, Year Five, Write-offs     0   0
Loans, Prior, Write-offs     0   0
Loans, Revolving, Write-offs     0   0
Loans, Total, Write-offs (0) (0) 0 (0) 0
Loans, Revolving Converted to Term, Write-offs     0   0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Pass [Member]          
Loans, Year One 2,033   2,033   632
Loans, Year Two 4,482   4,482   1,105
Loans, Year Three 1,822   1,822   0
Loans, Year Four 9,381   9,381   2,064
Loans, Year Five 5,991   5,991   2,355
Loans, Prior 9,401   9,401   4,639
Loans, Revolving 156   156   520
Loans, Revolving Converted to Term 0   0   0
Loans, Total 33,266   33,266   11,315
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Special Mention [Member]          
Loans, Year One 0   0   0
Loans, Year Two 0   0   0
Loans, Year Three 0   0   171
Loans, Year Four 0   0   0
Loans, Year Five 0   0   0
Loans, Prior 149   149   4,460
Loans, Revolving 0   0   450
Loans, Revolving Converted to Term 0   0   0
Loans, Total 149   149   5,081
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Substandard [Member]          
Loans, Year One 0   0   0
Loans, Year Two 0   0   0
Loans, Year Three 0   0   0
Loans, Year Four 0   0   0
Loans, Year Five 0   0   0
Loans, Prior 273   273   253
Loans, Revolving 0   0   0
Loans, Revolving Converted to Term 0   0   0
Loans, Total 273   273   253
Residential Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]          
Loans, Year One 0   0    
Loans, Year Two 0   0    
Loans, Year Three 4,307   4,307    
Loans, Year Four 0   0    
Loans, Year Five 0   0    
Loans, Prior 0   0    
Loans, Revolving 0   0    
Loans, Revolving Converted to Term 0   0    
Loans, Total 4,307   4,307    
Residential Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]          
Loans, Year One 0   0   110
Loans, Year Two 0   0   0
Loans, Year Three 0   0   0
Loans, Year Four 103   103   0
Loans, Year Five 0   0   0
Loans, Prior 0   0   0
Loans, Revolving 987   987   0
Loans, Revolving Converted to Term 0   0   0
Loans, Total 1,090   1,090   110
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member]          
Loans, Year One 0   0   0
Loans, Year Two 0   0   0
Loans, Year Three 0   0   0
Loans, Year Four 103   103   0
Loans, Year Five 0   0   0
Loans, Prior 0   0   0
Loans, Revolving 51,714   51,714   34,993
Loans, Revolving Converted to Term 2,397   2,397   3,762
Loans, Total 54,214   54,214   38,755
Loans, Year One, Write-offs     0   0
Loans, Year Two, Write-offs     0   0
Loans, Year Three, Write-offs     0   0
Loans, Year Four, Write-offs     0   0
Loans, Year Five, Write-offs     0   0
Loans, Prior, Write-offs     0   0
Loans, Revolving, Write-offs     19   0
Loans, Total, Write-offs 19 (0) 19 (0) 0
Loans, Revolving Converted to Term, Write-offs     0   0
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Pass [Member]          
Loans, Year One 0   0   0
Loans, Year Two 0   0   0
Loans, Year Three 0   0   0
Loans, Year Four 0   0   0
Loans, Year Five 0   0   0
Loans, Prior 0   0  
Loans, Revolving 50,727   50,727   34,622
Loans, Revolving Converted to Term 2,397   2,397   3,483
Loans, Total 53,124   53,124   38,105
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Substandard [Member]          
Loans, Year One 423   423   0
Loans, Year Two 0   0   0
Loans, Year Three 2,977   2,977   0
Loans, Year Four 5,755   5,755   0
Loans, Year Five 3,601   3,601   0
Loans, Prior 8,924   8,924  
Loans, Revolving 4,330   4,330   371
Loans, Revolving Converted to Term 0   0   279
Loans, Total 26,010   26,010   650
Commercial and Residential Portfolio Segments [Member]          
Loans, Year One 108,753   108,753   139,316
Loans, Year Two 174,924   174,924   134,064
Loans, Year Three 188,332   188,332   182,974
Loans, Year Four 236,865   236,865   112,671
Loans, Year Five 181,671   181,671   95,392
Loans, Prior 411,339   411,339   204,368
Loans, Revolving 131,224   131,224   75,316
Loans, Revolving Converted to Term 2,397   2,397   3,762
Loans, Total 1,435,505   1,435,505   947,863
Loans, Year One, Write-offs     0   0
Loans, Year Two, Write-offs     114   86
Loans, Year Three, Write-offs     11   43
Loans, Year Four, Write-offs     51   0
Loans, Year Five, Write-offs     0   0
Loans, Prior, Write-offs     0   22
Loans, Revolving, Write-offs     44   151
Loans, Total, Write-offs     220   302
Loans, Revolving Converted to Term, Write-offs     0   0
Commercial and Residential Portfolio Segments [Member] | Pass [Member]          
Loans, Year One 106,222   106,222   138,627
Loans, Year Two 174,924   174,924   131,057
Loans, Year Three 180,549   180,549   174,993
Loans, Year Four 223,743   223,743   108,252
Loans, Year Five 175,375   175,375   92,617
Loans, Prior 392,022   392,022   194,909
Loans, Revolving 123,178   123,178   68,872
Loans, Revolving Converted to Term 2,397   2,397   3,483
Loans, Total 1,378,410   1,378,410   912,810
Commercial and Residential Portfolio Segments [Member] | Special Mention [Member]          
Loans, Year One 2,108   2,108   518
Loans, Year Two 0   0   53
Loans, Year Three 4,806   4,806   1,697
Loans, Year Four 7,367   7,367   802
Loans, Year Five 2,695   2,695   1,307
Loans, Prior 10,393   10,393   6,135
Loans, Revolving 3,716   3,716   1,497
Loans, Revolving Converted to Term 0   0   0
Loans, Total 31,085   31,085   12,009
Commercial and Residential Portfolio Segments [Member] | Substandard [Member]          
Loans, Year One         171
Loans, Year Two         2,954
Loans, Year Three         6,284
Loans, Year Four         3,617
Loans, Year Five         1,468
Loans, Prior         3,324
Loans, Revolving         4,947
Loans, Revolving Converted to Term         279
Loans, Total         23,044
Consumer Portfolio Segment [Member]          
Loans, Year One 5,117   5,117   2,433
Loans, Year Two 7,036   7,036   24,603
Loans, Year Three 20,391   20,391   23,425
Loans, Year Four 20,084   20,084   10,934
Loans, Year Five 6,935   6,935   4,998
Loans, Prior 4,448   4,448   4,156
Loans, Revolving 463   463   159
Loans, Revolving Converted to Term 0   0   0
Loans, Total 64,474   64,474   70,708
Consumer Portfolio Segment [Member] | Automobile Loan [Member]          
Loans, Year One 0   0   0
Loans, Year Two 0   0   23,310
Loans, Year Three 17,948   17,948   22,602
Loans, Year Four 16,507   16,507   10,613
Loans, Year Five 6,786   6,786   4,908
Loans, Prior 4,413   4,413   4,151
Loans, Revolving 0   0   0
Loans, Revolving Converted to Term 0   0   0
Loans, Total 45,654   45,654   65,584
Loans, Year One, Write-offs     0   0
Loans, Year Two, Write-offs     0   389
Loans, Year Three, Write-offs     100   598
Loans, Year Four, Write-offs     181   262
Loans, Year Five, Write-offs     25   171
Loans, Prior, Write-offs     102   223
Loans, Revolving, Write-offs     0   0
Loans, Total, Write-offs 157 396 408 1,292 1,643
Loans, Revolving Converted to Term, Write-offs     0   0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Performing Financial Instruments [Member]          
Loans, Year One 0   0   0
Loans, Year Two 0   0   23,163
Loans, Year Three 17,744   17,744   22,361
Loans, Year Four 16,310   16,310   10,426
Loans, Year Five 6,529   6,529   4,779
Loans, Prior 4,248   4,248   4,063
Loans, Revolving 0   0   0
Loans, Revolving Converted to Term 0   0   0
Loans, Total 44,831   44,831   64,792
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonperforming Financial Instruments [Member]          
Loans, Year One 0   0   0
Loans, Year Two 0   0   147
Loans, Year Three 204   204   241
Loans, Year Four 197   197   187
Loans, Year Five 257   257   129
Loans, Prior 165   165   88
Loans, Revolving 0   0   0
Loans, Revolving Converted to Term 0   0   0
Loans, Total 823   823   792
Consumer Portfolio Segment [Member] | Other Loans [Member]          
Loans, Year One 5,117   5,117   2,433
Loans, Year Two 7,036   7,036   1,293
Loans, Year Three 2,443   2,443   823
Loans, Year Four 3,577   3,577   321
Loans, Year Five 149   149   90
Loans, Prior 35   35   5
Loans, Revolving 463   463   159
Loans, Revolving Converted to Term 0   0   0
Loans, Total 18,820   18,820   5,124
Loans, Year One, Write-offs     0   0
Loans, Year Two, Write-offs     36   9
Loans, Year Three, Write-offs     38   35
Loans, Year Four, Write-offs     18   31
Loans, Year Five, Write-offs     2   6
Loans, Prior, Write-offs     8   12
Loans, Revolving, Write-offs     0   1
Loans, Total, Write-offs 23 $ 16 102 $ 65 94
Loans, Revolving Converted to Term, Write-offs     0   0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Performing Financial Instruments [Member]          
Loans, Year One 5,117   5,117   2,433
Loans, Year Two 7,032   7,032   1,245
Loans, Year Three 2,442   2,442   799
Loans, Year Four 3,571   3,571   318
Loans, Year Five 148   148   88
Loans, Prior 35   35   5
Loans, Revolving 463   463   157
Loans, Revolving Converted to Term 0   0   0
Loans, Total 18,808   18,808   5,045
Consumer Portfolio Segment [Member] | Other Loans [Member] | Nonperforming Financial Instruments [Member]          
Loans, Year One 0   0   0
Loans, Year Two 4   4   48
Loans, Year Three 1   1   24
Loans, Year Four 6   6   3
Loans, Year Five 1   1   2
Loans, Prior 0   0   0
Loans, Revolving 0   0   2
Loans, Revolving Converted to Term 0   0   0
Loans, Total $ 12   $ 12   $ 79