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Note 3 - Loans - Analysis of the Credit Risk Profile of Each Loan Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Loans $ 1,449,950 $ 972,974 $ 1,466,595
Current period gross write-offs, total 2,490 414 4,034
Real Estate 1 [Member] | Construction and Land Development [Member]      
Loans, current year 256   4,445
Loans, one year before 1,119   5,401
Loans, two years before 2,809   2,421
Loans, three years before 2,138   5,829
Loans, four years before 4,666   4,424
Loans, prior 7,881   5,451
Loans, revolving 62,727   56,509
Loans 81,596 53,364 84,480
Current period gross write-offs, current year 0   0
Current period gross write-offs. one year before 0   0
Current period gross write-offs, two years before 0   0
Current period gross write-offs, three years before 0   0
Current period gross write-offs, four years before 0   0
Current period gross write-offs, prior 22   4
Current period gross write-offs, revolving 0   0
Current period gross write-offs, total 22 4 4
Real Estate 1 [Member] | Construction and Land Development [Member] | Pass [Member]      
Loans, current year 256   4,419
Loans, one year before 1,093   5,401
Loans, two years before 2,809   2,421
Loans, three years before 2,138   5,811
Loans, four years before 4,666   4,424
Loans, prior 7,832   5,419
Loans, revolving 62,727   56,509
Loans 81,521   84,404
Real Estate 1 [Member] | Construction and Land Development [Member] | Special Mention [Member]      
Loans, current year 0   26
Loans, one year before 0   0
Loans, two years before 0   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 0   0
Loans, revolving 0   0
Loans 0   26
Real Estate 1 [Member] | Construction and Land Development [Member] | Substandard [Member]      
Loans, current year 0   0
Loans, one year before 26   0
Loans, two years before 0   0
Loans, three years before 0   18
Loans, four years before 0   0
Loans, prior 49   32
Loans, revolving 0   0
Loans 75   50
Real Estate 1 [Member] | Construction and Land Development [Member] | Doubtful [Member]      
Loans, current year 0   0
Loans, one year before 0   0
Loans, two years before 0   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 0   0
Loans, revolving 0   0
Loans 0   0
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]      
Loans, current year 7,150   32,729
Loans, one year before 30,945   69,916
Loans, two years before 68,683   113,787
Loans, three years before 110,276   99,787
Loans, four years before 98,923   49,250
Loans, prior 159,576   116,958
Loans, revolving 73,949   64,740
Loans 549,502 347,014 547,167
Current period gross write-offs, current year 0   20
Current period gross write-offs. one year before 0   0
Current period gross write-offs, two years before 0   0
Current period gross write-offs, three years before 0   0
Current period gross write-offs, four years before 0   0
Current period gross write-offs, prior 3   18
Current period gross write-offs, revolving 0   0
Current period gross write-offs, total 3 10 38
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Pass [Member]      
Loans, current year 7,150   32,609
Loans, one year before 30,825   69,884
Loans, two years before 68,652   113,535
Loans, three years before 110,030   99,470
Loans, four years before 98,561   49,250
Loans, prior 157,308   115,032
Loans, revolving 73,949   64,740
Loans 546,475   544,520
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Special Mention [Member]      
Loans, current year 0   120
Loans, one year before 120   0
Loans, two years before 0   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 304   83
Loans, revolving 0   0
Loans 424   203
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Substandard [Member]      
Loans, current year 0   0
Loans, one year before 0   32
Loans, two years before 31   252
Loans, three years before 246   317
Loans, four years before 362  
Loans, prior 1,964   1,843
Loans, revolving 0   0
Loans 2,603   2,444
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Doubtful [Member]      
Loans, current year 0   0
Loans, one year before 0   0
Loans, two years before 0   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 0   0
Loans, revolving 0   0
Loans 0   0
Real Estate 1 [Member] | Other Real Estate Loans [Member]      
Loans, current year 12,581   65,276
Loans, one year before 62,257   83,725
Loans, two years before 82,556   142,077
Loans, three years before 135,595   120,012
Loans, four years before 117,099   48,238
Loans, prior 229,074   197,303
Loans, revolving 26,520   15,531
Loans 665,682 445,085 672,162
Current period gross write-offs, current year 0   0
Current period gross write-offs. one year before 0   0
Current period gross write-offs, two years before 0   0
Current period gross write-offs, three years before 0   0
Current period gross write-offs, four years before 0   0
Current period gross write-offs, prior 0   0
Current period gross write-offs, revolving 0   0
Current period gross write-offs, total 0 (0) 0
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Pass [Member]      
Loans, current year 12,581   64,958
Loans, one year before 61,941   83,725
Loans, two years before 82,556   142,077
Loans, three years before 135,595   120,012
Loans, four years before 117,099   48,238
Loans, prior 224,733   192,869
Loans, revolving 26,520   15,531
Loans 661,025   667,410
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Special Mention [Member]      
Loans, current year 0   318
Loans, one year before 316   0
Loans, two years before 0   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 3,993   4,072
Loans, revolving 0   0
Loans 4,309   4,390
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Substandard [Member]      
Loans, current year 0   0
Loans, one year before 0   0
Loans, two years before 0   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 348   362
Loans, revolving 0   0
Loans 348   362
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Doubtful [Member]      
Loans, current year 0   0
Loans, one year before 0   0
Loans, two years before 0   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 0   0
Loans, revolving 0   0
Loans 0   0
Commercial and Industrial Loans [Member]      
Loans, current year 712   25,315
Loans, one year before 21,331   25,572
Loans, two years before 21,918   26,729
Loans, three years before 22,510   23,733
Loans, four years before 20,431   3,583
Loans, prior 13,868   13,774
Loans, revolving 31,626   22,627
Loans 132,396 113,562 141,333
Current period gross write-offs, current year 0   110
Current period gross write-offs. one year before 618   1,275
Current period gross write-offs, two years before 170   772
Current period gross write-offs, three years before 1,314   1,519
Current period gross write-offs, four years before 239   20
Current period gross write-offs, prior 2   3
Current period gross write-offs, revolving 0   0
Current period gross write-offs, total 2,343 317 3,699
Commercial and Industrial Loans [Member] | Pass [Member]      
Loans, current year 712   24,270
Loans, one year before 20,908   24,835
Loans, two years before 21,114   21,819
Loans, three years before 18,881   23,086
Loans, four years before 20,126   3,583
Loans, prior 12,912   12,815
Loans, revolving 31,626   22,627
Loans 126,279   133,035
Commercial and Industrial Loans [Member] | Special Mention [Member]      
Loans, current year 0   430
Loans, one year before 423   0
Loans, two years before 0   1,211
Loans, three years before 1,179   0
Loans, four years before 0   0
Loans, prior 518   513
Loans, revolving 0   0
Loans 2,120   2,154
Commercial and Industrial Loans [Member] | Substandard [Member]      
Loans, current year 0   615
Loans, one year before 0   737
Loans, two years before 804   3,699
Loans, three years before 2,450   647
Loans, four years before 305  
Loans, prior 438   446
Loans, revolving 0   0
Loans 3,997   6,144
Commercial and Industrial Loans [Member] | Doubtful [Member]      
Loans, current year 0   0
Loans, one year before 0   0
Loans, two years before 0   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 0   0
Loans, revolving 0   0
Loans 0   0
Consumer and Other Loans [Member]      
Loans, current year 1,763   5,129
Loans, one year before 3,281   1,967
Loans, two years before 1,665   1,437
Loans, three years before 1,200   130
Loans, four years before 180   1,306
Loans, prior 3,728   2,567
Loans, revolving 8,957   8,917
Loans 20,774 13,949 21,453
Current period gross write-offs, current year 0   249
Current period gross write-offs. one year before 0   29
Current period gross write-offs, two years before 0   9
Current period gross write-offs, three years before 0   3
Current period gross write-offs, four years before 0   1
Current period gross write-offs, prior 0   2
Current period gross write-offs, revolving 122   0
Current period gross write-offs, total 122 $ 83 293
Consumer and Other Loans [Member] | Pass [Member]      
Loans, current year 1,763   5,129
Loans, one year before 3,281   1,697
Loans, two years before 1,295   1,437
Loans, three years before 1,200   130
Loans, four years before 180   1,306
Loans, prior 3,727   2,566
Loans, revolving 8,957   8,917
Loans 20,403   21,182
Consumer and Other Loans [Member] | Special Mention [Member]      
Loans, current year 0   0
Loans, one year before 0   270
Loans, two years before 370   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 0   0
Loans, revolving 0   0
Loans 370   270
Consumer and Other Loans [Member] | Substandard [Member]      
Loans, current year 0   0
Loans, one year before 0   0
Loans, two years before 0   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 1   1
Loans, revolving 0   0
Loans 1   1
Consumer and Other Loans [Member] | Doubtful [Member]      
Loans, current year 0   0
Loans, one year before 0   0
Loans, two years before 0   0
Loans, three years before 0   0
Loans, four years before 0   0
Loans, prior 0   0
Loans, revolving 0   0
Loans $ 0   $ 0