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Note 3 - Loans Receivable - Internal Classification of the Loan Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Year One $ 63,552   $ 237,469
Financing Receivable, Year Two 220,948   170,103
Financing Receivable, Year Three 164,750   150,031
Financing Receivable, Year Four 139,620   284,826
Financing Receivable, Year Five 275,170   169,201
Financing Receivable, prior 414,457   268,242
Financing Receivable, revolving 240,789   239,147
Loans receivable 1,519,286   1,519,019
Pass [Member]      
Financing Receivable, Year One 62,851   236,822
Financing Receivable, Year Two 220,322   166,249
Financing Receivable, Year Three 161,583   145,740
Financing Receivable, Year Four 134,727   281,836
Financing Receivable, Year Five 272,214   168,640
Financing Receivable, prior 405,190   260,086
Financing Receivable, revolving 236,180   234,595
Loans receivable 1,493,067   1,493,968
Substandard [Member]      
Financing Receivable, Year One 0   205
Financing Receivable, Year Two 185   2,393
Financing Receivable, Year Three 1,950   1,557
Financing Receivable, Year Four 1,537   1,847
Financing Receivable, Year Five 1,843   482
Financing Receivable, prior 7,068   5,525
Financing Receivable, revolving 327   325
Loans receivable 12,910   12,334
Special Mention [Member]      
Financing Receivable, Year One 701   442
Financing Receivable, Year Two 441   1,461
Financing Receivable, Year Three 1,217   2,734
Financing Receivable, Year Four 3,356   1,143
Financing Receivable, Year Five 1,113   79
Financing Receivable, prior 2,199   2,631
Financing Receivable, revolving 4,282   4,227
Loans receivable 13,309   12,717
Residential Portfolio Segment [Member]      
Loans receivable 188,784   183,793
Current-period gross charge-offs, total (0) $ (0)  
Residential Portfolio Segment [Member] | One-to-Four Family Loans [Member]      
Financing Receivable, Year One 4,870   20,044
Financing Receivable, Year Two 17,906   15,428
Financing Receivable, Year Three 15,308   22,525
Financing Receivable, Year Four 21,680   30,570
Financing Receivable, Year Five 29,330   17,751
Financing Receivable, prior 54,916   40,864
Financing Receivable, revolving 1,060   1,333
Loans receivable 145,070   148,515
Current-period gross charge-offs, year one 0   0
Current-period gross charge-offs, year two 0   0
Current-period gross charge-offs, year three 0   0
Current-period gross charge-offs, year four 0   0
Current-period gross charge-offs, year five 0   0
Current-period gross charge-offs, prior 0   0
Current-period gross charge-offs, revolving 0   0
Current-period gross charge-offs, total 0   0
Residential Portfolio Segment [Member] | One-to-Four Family Loans [Member] | Pass [Member]      
Financing Receivable, Year One 4,870   20,044
Financing Receivable, Year Two 17,906   15,428
Financing Receivable, Year Three 15,308   22,525
Financing Receivable, Year Four 21,680   29,851
Financing Receivable, Year Five 28,615   17,751
Financing Receivable, prior 54,324   40,339
Financing Receivable, revolving 1,060   1,333
Loans receivable 143,763   147,271
Residential Portfolio Segment [Member] | One-to-Four Family Loans [Member] | Substandard [Member]      
Financing Receivable, Year One 0   0
Financing Receivable, Year Two 0   0
Financing Receivable, Year Three 0   0
Financing Receivable, Year Four 0   719
Financing Receivable, Year Five 715   0
Financing Receivable, prior 592   525
Financing Receivable, revolving 0   0
Loans receivable 1,307   1,244
Residential Portfolio Segment [Member] | One-to-Four Family Construction [Member]      
Financing Receivable, Year One 11,789   19,065
Financing Receivable, Year Two 17,908   4,324
Financing Receivable, Year Three 1,939   1,760
Financing Receivable, Year Four 1,493   10,129
Financing Receivable, Year Five 10,129   0
Financing Receivable, prior 0   0
Financing Receivable, revolving 456   0
Loans receivable 43,714   35,278
Current-period gross charge-offs, year one 0   0
Current-period gross charge-offs, year two 0   0
Current-period gross charge-offs, year three 0   0
Current-period gross charge-offs, year four 0   0
Current-period gross charge-offs, year five 0   0
Current-period gross charge-offs, prior 0   0
Current-period gross charge-offs, revolving 0   0
Current-period gross charge-offs, total 0   0
Residential Portfolio Segment [Member] | One-to-Four Family Construction [Member] | Pass [Member]      
Financing Receivable, Year One 11,789   19,065
Financing Receivable, Year Two 17,908   3,975
Financing Receivable, Year Three 1,590   1,760
Financing Receivable, Year Four 1,493   10,129
Financing Receivable, Year Five 10,129   0
Financing Receivable, prior 0   0
Financing Receivable, revolving 456   0
Loans receivable 43,365   34,929
Residential Portfolio Segment [Member] | One-to-Four Family Construction [Member] | Special Mention [Member]      
Financing Receivable, Year One 0   0
Financing Receivable, Year Two 0   349
Financing Receivable, Year Three 349   0
Financing Receivable, Year Four 0   0
Financing Receivable, Year Five 0   0
Financing Receivable, prior 0   0
Financing Receivable, revolving 0   0
Loans receivable 349   349
Commercial Real Estate Portfolio Segment [Member]      
Loans receivable 926,631   918,839
Current-period gross charge-offs, total (0) (0)  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Financing Receivable, Year One 20,552   41,530
Financing Receivable, Year Two 49,189   51,964
Financing Receivable, Year Three 69,731   64,078
Financing Receivable, Year Four 62,776   177,909
Financing Receivable, Year Five 173,451   112,774
Financing Receivable, prior 250,241   145,571
Financing Receivable, revolving 41,745   42,144
Loans receivable 667,685   635,970
Current-period gross charge-offs, year one 0   0
Current-period gross charge-offs, year two 0   0
Current-period gross charge-offs, year three 0   0
Current-period gross charge-offs, year four 0   0
Current-period gross charge-offs, year five 0   0
Current-period gross charge-offs, prior 0   33
Current-period gross charge-offs, revolving 0   0
Current-period gross charge-offs, total 0   33
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Pass [Member]      
Financing Receivable, Year One 20,552   41,530
Financing Receivable, Year Two 49,189   51,964
Financing Receivable, Year Three 69,731   63,566
Financing Receivable, Year Four 61,487   177,502
Financing Receivable, Year Five 173,058   112,350
Financing Receivable, prior 244,772   141,336
Financing Receivable, revolving 38,747   39,155
Loans receivable 657,536   627,403
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Substandard [Member]      
Financing Receivable, Year One 0   0
Financing Receivable, Year Two 0   0
Financing Receivable, Year Three 0   512
Financing Receivable, Year Four 500   0
Financing Receivable, Year Five 0   424
Financing Receivable, prior 3,380   2,970
Financing Receivable, revolving 0   0
Loans receivable 3,880   3,906
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Special Mention [Member]      
Financing Receivable, Year One 0   0
Financing Receivable, Year Two 0   0
Financing Receivable, Year Three 0   0
Financing Receivable, Year Four 789   407
Financing Receivable, Year Five 393   0
Financing Receivable, prior 2,089   1,265
Financing Receivable, revolving 2,998   2,989
Loans receivable 6,269   4,661
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]      
Financing Receivable, Year One 915   44,051
Financing Receivable, Year Two 39,392   26,041
Financing Receivable, Year Three 11,852   9,483
Financing Receivable, Year Four 6,085   14,272
Financing Receivable, Year Five 13,024   7,325
Financing Receivable, prior 19,149   12,778
Financing Receivable, revolving 7,865   6,339
Loans receivable 98,282   120,289
Current-period gross charge-offs, year one 0   0
Current-period gross charge-offs, year two 0   0
Current-period gross charge-offs, year three 0   0
Current-period gross charge-offs, year four 0   0
Current-period gross charge-offs, year five 0   0
Current-period gross charge-offs, prior 0   0
Current-period gross charge-offs, revolving 0   0
Current-period gross charge-offs, total 0   0
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]      
Financing Receivable, Year One 915   44,051
Financing Receivable, Year Two 39,392   26,041
Financing Receivable, Year Three 11,852   9,483
Financing Receivable, Year Four 6,085   14,272
Financing Receivable, Year Five 13,024   7,325
Financing Receivable, prior 18,232   11,853
Financing Receivable, revolving 7,865   6,339
Loans receivable 97,365   119,364
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]      
Financing Receivable, Year One 0   0
Financing Receivable, Year Two 0   0
Financing Receivable, Year Three 0   0
Financing Receivable, Year Four 0   0
Financing Receivable, Year Five 0   0
Financing Receivable, prior 917   925
Financing Receivable, revolving     0
Loans receivable 917   925
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]      
Financing Receivable, revolving 0    
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]      
Financing Receivable, Year One 3,960   30,610
Financing Receivable, Year Two 30,203   20,181
Financing Receivable, Year Three 19,897   17,101
Financing Receivable, Year Four 16,801   27,797
Financing Receivable, Year Five 27,506   17,642
Financing Receivable, prior 60,349   47,232
Financing Receivable, revolving 1,948   2,017
Loans receivable 160,664   162,580
Current-period gross charge-offs, year one 0   0
Current-period gross charge-offs, year two 0   0
Current-period gross charge-offs, year three 0   0
Current-period gross charge-offs, year four 0   0
Current-period gross charge-offs, year five 0   0
Current-period gross charge-offs, prior 0   0
Current-period gross charge-offs, revolving 0   0
Current-period gross charge-offs, total 0   0
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member] | Pass [Member]      
Financing Receivable, Year One 3,404   30,610
Financing Receivable, Year Two 30,203   19,993
Financing Receivable, Year Three 19,713   16,219
Financing Receivable, Year Four 15,982   26,109
Financing Receivable, Year Five 25,821   17,580
Financing Receivable, prior 59,141   45,784
Financing Receivable, revolving 1,892   1,961
Loans receivable 156,156   158,256
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member] | Substandard [Member]      
Financing Receivable, Year One 0   0
Financing Receivable, Year Two 0   188
Financing Receivable, Year Three 184   55
Financing Receivable, Year Four 0   1,118
Financing Receivable, Year Five 1,118   0
Financing Receivable, prior 1,185   729
Financing Receivable, revolving 56   56
Loans receivable 2,543   2,146
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member] | Special Mention [Member]      
Financing Receivable, Year One 556   0
Financing Receivable, Year Two 0   0
Financing Receivable, Year Three 0   827
Financing Receivable, Year Four 819   570
Financing Receivable, Year Five 567   62
Financing Receivable, prior 23   719
Financing Receivable, revolving 0   0
Loans receivable 1,965   2,178
Home Equity Portfolio Segment [Member]      
Financing Receivable, Year One 905   2,162
Financing Receivable, Year Two 1,931   1,218
Financing Receivable, Year Three 1,197   1,051
Financing Receivable, Year Four 948   2,804
Financing Receivable, Year Five 2,672   321
Financing Receivable, prior 2,422   2,259
Financing Receivable, revolving 99,203   98,258
Loans receivable 109,278   108,073
Current-period gross charge-offs, year one 0   0
Current-period gross charge-offs, year two 0   1
Current-period gross charge-offs, year three 0   0
Current-period gross charge-offs, year four 0   0
Current-period gross charge-offs, year five 0   0
Current-period gross charge-offs, prior 0   26
Current-period gross charge-offs, revolving 0   0
Current-period gross charge-offs, total (0) (0) 27
Home Equity Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Year One 905   2,162
Financing Receivable, Year Two 1,931   1,218
Financing Receivable, Year Three 1,197   1,018
Financing Receivable, Year Four 948   2,804
Financing Receivable, Year Five 2,672   281
Financing Receivable, prior 2,344   2,227
Financing Receivable, revolving 98,373   97,660
Loans receivable 108,370   107,370
Home Equity Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Year One 0   0
Financing Receivable, Year Two 0   0
Financing Receivable, Year Three 0   33
Financing Receivable, Year Four 0   0
Financing Receivable, Year Five 0   40
Financing Receivable, prior 59   11
Financing Receivable, revolving 249   250
Loans receivable 308   334
Home Equity Portfolio Segment [Member] | Special Mention [Member]      
Financing Receivable, Year One 0   0
Financing Receivable, Year Two 0   0
Financing Receivable, Year Three 0   0
Financing Receivable, Year Four 0   0
Financing Receivable, Year Five 0   0
Financing Receivable, prior 19   21
Financing Receivable, revolving 581   348
Loans receivable 600   369
Consumer Portfolio Segment [Member]      
Financing Receivable, Year One 2,186   9,182
Financing Receivable, Year Two 7,746   5,595
Financing Receivable, Year Three 5,007   3,997
Financing Receivable, Year Four 3,298   2,322
Financing Receivable, Year Five 1,924   654
Financing Receivable, prior 1,097   686
Financing Receivable, revolving 1,896   1,988
Loans receivable 23,154   24,424
Current-period gross charge-offs, year one 0   0
Current-period gross charge-offs, year two 11   17
Current-period gross charge-offs, year three 15   47
Current-period gross charge-offs, year four 13   14
Current-period gross charge-offs, year five 0   0
Current-period gross charge-offs, prior 0   83
Current-period gross charge-offs, revolving 1   14
Current-period gross charge-offs, total 40 6 175
Consumer Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Year One 2,186   9,069
Financing Receivable, Year Two 7,643   5,536
Financing Receivable, Year Three 4,970   3,899
Financing Receivable, Year Four 3,226   2,312
Financing Receivable, Year Five 1,914   654
Financing Receivable, prior 1,096   670
Financing Receivable, revolving 1,878   1,973
Loans receivable 22,913   24,113
Consumer Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Year One 0   113
Financing Receivable, Year Two 103   59
Financing Receivable, Year Three 37   92
Financing Receivable, Year Four 72   10
Financing Receivable, Year Five 10   0
Financing Receivable, prior 1   16
Financing Receivable, revolving 18   15
Loans receivable 241   305
Consumer Portfolio Segment [Member] | Special Mention [Member]      
Financing Receivable, Year One     0
Financing Receivable, Year Two     0
Financing Receivable, Year Three     6
Financing Receivable, Year Four     0
Financing Receivable, Year Five     0
Financing Receivable, prior     0
Financing Receivable, revolving     0
Loans receivable     6
Commercial Portfolio Segment [Member]      
Loans receivable 271,439   283,890
Current-period gross charge-offs, total 14 $ (0)  
Commercial Portfolio Segment [Member] | Commercial Loans [Member]      
Financing Receivable, Year One 9,801   27,494
Financing Receivable, Year Two 27,566   27,975
Financing Receivable, Year Three 25,690   19,820
Financing Receivable, Year Four 18,776   13,811
Financing Receivable, Year Five 13,124   10,302
Financing Receivable, prior 22,575   15,518
Financing Receivable, revolving 34,048   34,511
Loans receivable 151,580   149,431
Current-period gross charge-offs, year one 0   0
Current-period gross charge-offs, year two 0   0
Current-period gross charge-offs, year three 0   0
Current-period gross charge-offs, year four 0   6
Current-period gross charge-offs, year five 0   0
Current-period gross charge-offs, prior 14   0
Current-period gross charge-offs, revolving 0   0
Current-period gross charge-offs, total 14   6
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member]      
Financing Receivable, Year One 9,656   27,402
Financing Receivable, Year Two 27,484   26,864
Financing Receivable, Year Three 24,602   19,468
Financing Receivable, Year Four 18,437   13,647
Financing Receivable, Year Five 12,971   10,284
Financing Receivable, prior 22,382   15,376
Financing Receivable, revolving 33,844   34,160
Loans receivable 149,376   147,201
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member]      
Financing Receivable, Year One 0   92
Financing Receivable, Year Two 82   1,111
Financing Receivable, Year Three 1,088   41
Financing Receivable, Year Four 41   0
Financing Receivable, Year Five 0   18
Financing Receivable, prior 142   142
Financing Receivable, revolving 4   4
Loans receivable 1,357   1,408
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Special Mention [Member]      
Financing Receivable, Year One 145   0
Financing Receivable, Year Two 0   0
Financing Receivable, Year Three 0   311
Financing Receivable, Year Four 298   164
Financing Receivable, Year Five 153   0
Financing Receivable, prior 51   0
Financing Receivable, revolving 200   347
Loans receivable 847   822
Commercial Portfolio Segment [Member] | Agricultural Loan [Member]      
Financing Receivable, Year One 8,574   43,331
Financing Receivable, Year Two 29,107   17,377
Financing Receivable, Year Three 14,129   10,216
Financing Receivable, Year Four 7,763   5,212
Financing Receivable, Year Five 4,010   2,432
Financing Receivable, prior 3,708   3,334
Financing Receivable, revolving 52,568   52,557
Loans receivable 119,859   134,459
Current-period gross charge-offs, year one 0   0
Current-period gross charge-offs, year two 0   0
Current-period gross charge-offs, year three 0   0
Current-period gross charge-offs, year four 0   0
Current-period gross charge-offs, year five 0   0
Current-period gross charge-offs, prior 0   0
Current-period gross charge-offs, revolving 0   0
Current-period gross charge-offs, total 0   0
Commercial Portfolio Segment [Member] | Agricultural Loan [Member] | Pass [Member]      
Financing Receivable, Year One 8,574   42,889
Financing Receivable, Year Two 28,666   15,230
Financing Receivable, Year Three 12,620   7,802
Financing Receivable, Year Four 5,389   5,210
Financing Receivable, Year Five 4,010   2,415
Financing Receivable, prior 2,899   2,501
Financing Receivable, revolving 52,065   52,014
Loans receivable 114,223   128,061
Commercial Portfolio Segment [Member] | Agricultural Loan [Member] | Substandard [Member]      
Financing Receivable, Year One 0   0
Financing Receivable, Year Two 0   1,035
Financing Receivable, Year Three 641   824
Financing Receivable, Year Four 924   0
Financing Receivable, Year Five 0   0
Financing Receivable, prior 792   207
Financing Receivable, revolving 0   0
Loans receivable 2,357   2,066
Commercial Portfolio Segment [Member] | Agricultural Loan [Member] | Special Mention [Member]      
Financing Receivable, Year One 0   442
Financing Receivable, Year Two 441   1,112
Financing Receivable, Year Three 868   1,590
Financing Receivable, Year Four 1,450   2
Financing Receivable, Year Five 0   17
Financing Receivable, prior 17   626
Financing Receivable, revolving 503   543
Loans receivable $ 3,279   $ 4,332