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Note 7 - Loans and Related Allowance for Credit Losses - Classes of the Loan Portfolio Summarized by Credit Quality (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
Term loans amortized, current year $ 127,856   $ 127,856   $ 153,526
Term loans amortized, one year before 176,477   176,477   254,581
Term loans amortized, two years before 235,275   235,275   260,086
Term loans amortized, three years before 233,805   233,805   182,142
Term loans amortized, four years before 169,588   169,588   111,764
Term loans amortized, prior 382,826   382,826   321,137
Term loans amortized, revolving 281,197   281,197   236,378
Loans [2],[3] 1,607,024 [1],[4]   1,607,024 [1],[4]   1,519,614
Current-period gross charge-offs, total 68 $ 1,426 140 $ 1,439  
Pass [Member]          
Term loans amortized, current year 127,856   127,856   150,041
Term loans amortized, one year before 175,615   175,615   253,841
Term loans amortized, two years before 225,743   225,743   248,224
Term loans amortized, three years before 225,481   225,481   180,483
Term loans amortized, four years before 167,634   167,634   111,425
Term loans amortized, prior 351,644   351,644   282,320
Term loans amortized, revolving 259,031   259,031   233,892
Loans 1,533,004   1,533,004   1,460,226
Special Mention [Member]          
Term loans amortized, current year 0   0   2,263
Term loans amortized, one year before 0   0   0
Term loans amortized, two years before 7,238   7,238   3,340
Term loans amortized, three years before 678   678   389
Term loans amortized, four years before 331   331   0
Term loans amortized, prior 634   634   2,995
Term loans amortized, revolving 19,026   19,026   832
Loans 27,907   27,907   9,819
Substandard [Member]          
Term loans amortized, current year 0   0   1,222
Term loans amortized, one year before 862   862   740
Term loans amortized, two years before 2,294   2,294   8,522
Term loans amortized, three years before 7,646   7,646   1,270
Term loans amortized, four years before 1,623   1,623   339
Term loans amortized, prior 30,548   30,548   35,822
Term loans amortized, revolving 3,140   3,140   1,654
Loans 46,113   46,113   49,569
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]          
Term loans amortized, current year 32,496   32,496   13,398
Term loans amortized, one year before 18,550   18,550   20,265
Term loans amortized, two years before 29,794   29,794   37,924
Term loans amortized, three years before 35,990   35,990   39,414
Term loans amortized, four years before 39,265   39,265   25,532
Term loans amortized, prior 59,387   59,387   40,520
Term loans amortized, revolving 6,118   6,118   4,394
Loans [2],[3] 221,600 [1],[4]   221,600 [1],[4]   181,447
Current-period gross charge-offs, current year     0   0
Current-period gross charge-offs one year before     0   0
Current-period gross charge-offs, two years before     0   0
Current-period gross charge-offs, three years before     0   0
Current-period gross charge-offs, four years before     0   0
Current-period gross charge-offs, prior     0   45
Current-period gross charge-offs, revolving     0   0
Current-period gross charge-offs, total (0) 45 (0) 45 45
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Pass [Member]          
Term loans amortized, current year 32,496   32,496   12,424
Term loans amortized, one year before 17,688   17,688   20,265
Term loans amortized, two years before 26,103   26,103   33,389
Term loans amortized, three years before 31,492   31,492   39,025
Term loans amortized, four years before 38,894   38,894   25,532
Term loans amortized, prior 57,387   57,387   39,393
Term loans amortized, revolving 6,118   6,118   4,394
Loans 210,178   210,178   174,422
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Special Mention [Member]          
Term loans amortized, current year 0   0   0
Term loans amortized, one year before 0   0   0
Term loans amortized, two years before 3,691   3,691   0
Term loans amortized, three years before 0   0   389
Term loans amortized, four years before 0   0   0
Term loans amortized, prior 0   0   772
Term loans amortized, revolving 0   0   0
Loans 3,691   3,691   1,161
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Substandard [Member]          
Term loans amortized, current year 0   0   974
Term loans amortized, one year before 862   862   0
Term loans amortized, two years before 0   0   4,535
Term loans amortized, three years before 4,498   4,498   0
Term loans amortized, four years before 371   371   0
Term loans amortized, prior 2,000   2,000   355
Term loans amortized, revolving 0   0   0
Loans 7,731   7,731   5,864
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]          
Term loans amortized, current year 15,387   15,387   7,542
Term loans amortized, one year before 7,427   7,427   63,559
Term loans amortized, two years before 54,719   54,719   102,849
Term loans amortized, three years before 97,343   97,343   49,644
Term loans amortized, four years before 47,679   47,679   20,230
Term loans amortized, prior 167,056   167,056   167,562
Term loans amortized, revolving 743   743   905
Loans [2],[3] 390,354 [1],[4]   390,354 [1],[4]   412,291
Current-period gross charge-offs, current year     0   0
Current-period gross charge-offs one year before     0   0
Current-period gross charge-offs, two years before     0   0
Current-period gross charge-offs, three years before     0   0
Current-period gross charge-offs, four years before     0   0
Current-period gross charge-offs, prior     18   1,341
Current-period gross charge-offs, revolving     0   0
Current-period gross charge-offs, total (0) 1,341 18 1,341 1,341
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Pass [Member]          
Term loans amortized, current year 15,387   15,387   7,542
Term loans amortized, one year before 7,427   7,427   63,559
Term loans amortized, two years before 54,719   54,719   96,624
Term loans amortized, three years before 94,460   94,460   49,009
Term loans amortized, four years before 47,044   47,044   20,230
Term loans amortized, prior 141,040   141,040   133,530
Term loans amortized, revolving 743   743   905
Loans 360,820   360,820   371,399
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Special Mention [Member]          
Term loans amortized, current year 0   0   0
Term loans amortized, one year before 0   0   0
Term loans amortized, two years before 0   0   2,506
Term loans amortized, three years before 387   387   0
Term loans amortized, four years before 0   0   0
Term loans amortized, prior 234   234   2,002
Term loans amortized, revolving 0   0   0
Loans 621   621   4,508
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Substandard [Member]          
Term loans amortized, current year 0   0   0
Term loans amortized, one year before 0   0   0
Term loans amortized, two years before 0   0   3,719
Term loans amortized, three years before 2,496   2,496   635
Term loans amortized, four years before 635   635   0
Term loans amortized, prior 25,782   25,782   32,030
Term loans amortized, revolving 0   0   0
Loans 28,913   28,913   36,384
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]          
Term loans amortized, current year 0   0   2,930
Term loans amortized, one year before 2,885   2,885   36,113
Term loans amortized, two years before 45,017   45,017   21,978
Term loans amortized, three years before 18,823   18,823   7,437
Term loans amortized, four years before 6,742   6,742   10,057
Term loans amortized, prior 15,432   15,432   11,324
Term loans amortized, revolving 0   0   10
Loans [2],[3] 88,899 [1],[4]   88,899 [1],[4]   89,849
Current-period gross charge-offs, current year     0   0
Current-period gross charge-offs one year before     0   0
Current-period gross charge-offs, two years before     0   0
Current-period gross charge-offs, three years before     0   0
Current-period gross charge-offs, four years before     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) (0) (0) 0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Pass [Member]          
Term loans amortized, current year 0   0   2,930
Term loans amortized, one year before 2,885   2,885   36,113
Term loans amortized, two years before 45,017   45,017   21,978
Term loans amortized, three years before 18,823   18,823   7,437
Term loans amortized, four years before 6,742   6,742   10,057
Term loans amortized, prior 15,432   15,432   11,324
Term loans amortized, revolving 0   0   10
Loans 88,899   88,899   89,849
Residential Portfolio Segment [Member]          
Term loans amortized, current year 35,764   35,764   45,381
Term loans amortized, one year before 44,302   44,302   50,989
Term loans amortized, two years before 50,120   50,120   62,078
Term loans amortized, three years before 57,605   57,605   70,617
Term loans amortized, four years before 66,592   66,592   36,067
Term loans amortized, prior 111,612   111,612   88,019
Term loans amortized, revolving 312   312   291
Loans [2],[3] 366,307 [1],[4]   366,307 [1],[4]   353,442
Current-period gross charge-offs, current year     0   0
Current-period gross charge-offs one year before     0   0
Current-period gross charge-offs, two years before     0   0
Current-period gross charge-offs, three years before     0   0
Current-period gross charge-offs, four years before     0   0
Current-period gross charge-offs, prior     19   0
Current-period gross charge-offs, revolving     0   0
Current-period gross charge-offs, total 18 (0) 19 (0) 0
Residential Portfolio Segment [Member] | Pass [Member]          
Term loans amortized, current year 35,764   35,764   45,347
Term loans amortized, one year before 44,302   44,302   50,820
Term loans amortized, two years before 49,963   49,963   61,963
Term loans amortized, three years before 57,160   57,160   69,982
Term loans amortized, four years before 65,975   65,975   36,067
Term loans amortized, prior 110,348   110,348   86,492
Term loans amortized, revolving 312   312   291
Loans 363,824   363,824   350,962
Residential Portfolio Segment [Member] | Substandard [Member]          
Term loans amortized, current year 0   0   34
Term loans amortized, one year before 0   0   169
Term loans amortized, two years before 157   157   115
Term loans amortized, three years before 445   445   635
Term loans amortized, four years before 617   617   0
Term loans amortized, prior 1,264   1,264   1,527
Term loans amortized, revolving 0   0   0
Loans 2,483   2,483   2,480
Commercial And Industrial [Member]          
Term loans amortized, current year 38,498   38,498   51,131
Term loans amortized, one year before 45,765   45,765   33,870
Term loans amortized, two years before 35,225   35,225   31,305
Term loans amortized, three years before 21,549   21,549   13,512
Term loans amortized, four years before 8,243   8,243   19,169
Term loans amortized, prior 20,478   20,478   4,972
Term loans amortized, revolving 99,664   99,664   75,075
Loans [2],[3] 269,422 [1],[4]   269,422 [1],[4]   229,034
Current-period gross charge-offs, current year     0   0
Current-period gross charge-offs one year before     0   180
Current-period gross charge-offs, two years before     0   23
Current-period gross charge-offs, three years before     0   12
Current-period gross charge-offs, four years before     50   0
Current-period gross charge-offs, prior     5   0
Current-period gross charge-offs, revolving     0   0
Current-period gross charge-offs, total 50 35 55 35 215
Commercial And Industrial [Member] | Pass [Member]          
Term loans amortized, current year 38,498   38,498   48,654
Term loans amortized, one year before 45,765   45,765   33,860
Term loans amortized, two years before 30,265   30,265   31,305
Term loans amortized, three years before 21,242   21,242   13,512
Term loans amortized, four years before 7,912   7,912   18,864
Term loans amortized, prior 19,990   19,990   4,888
Term loans amortized, revolving 79,216   79,216   74,169
Loans 242,888   242,888   225,252
Commercial And Industrial [Member] | Special Mention [Member]          
Term loans amortized, current year 0   0   2,263
Term loans amortized, one year before 0   0   0
Term loans amortized, two years before 3,547   3,547   0
Term loans amortized, three years before 291   291   0
Term loans amortized, four years before 331   331   0
Term loans amortized, prior 212   212   0
Term loans amortized, revolving 19,026   19,026   832
Loans 23,407   23,407   3,095
Commercial And Industrial [Member] | Substandard [Member]          
Term loans amortized, current year 0   0   214
Term loans amortized, one year before 0   0   10
Term loans amortized, two years before 1,413   1,413   0
Term loans amortized, three years before 16   16   0
Term loans amortized, four years before 0   0   305
Term loans amortized, prior 276   276   84
Term loans amortized, revolving 1,422   1,422   74
Loans 3,127   3,127   687
Home Equity Lines of Credit [Member]          
Term loans amortized, current year 0   0   244
Term loans amortized, one year before 269   269   68
Term loans amortized, two years before 255   255   316
Term loans amortized, three years before 424   424   183
Term loans amortized, four years before 0   0   167
Term loans amortized, prior 3,151   3,151   2,534
Term loans amortized, revolving 155,706   155,706   139,867
Loans [2],[3] 159,805 [1],[4]   159,805 [1],[4]   143,379
Current-period gross charge-offs, current year     0   0
Current-period gross charge-offs one year before     0   0
Current-period gross charge-offs, two years before     0   0
Current-period gross charge-offs, three years before     0   0
Current-period gross charge-offs, four years before     0   0
Current-period gross charge-offs, prior     4   7
Current-period gross charge-offs, revolving     0   0
Current-period gross charge-offs, total (0) (0) 4 7 7
Home Equity Lines of Credit [Member] | Pass [Member]          
Term loans amortized, current year 0   0   244
Term loans amortized, one year before 269   269   0
Term loans amortized, two years before 22   22   166
Term loans amortized, three years before 233   233   183
Term loans amortized, four years before 0   0   133
Term loans amortized, prior 2,864   2,864   2,041
Term loans amortized, revolving 155,296   155,296   139,214
Loans 158,684   158,684   141,981
Home Equity Lines of Credit [Member] | Substandard [Member]          
Term loans amortized, current year 0   0   0
Term loans amortized, one year before 0   0   68
Term loans amortized, two years before 233   233   150
Term loans amortized, three years before 191   191   0
Term loans amortized, four years before 0   0   34
Term loans amortized, prior 287   287   493
Term loans amortized, revolving 410   410   653
Loans 1,121   1,121   1,398
Construction and Other [Member]          
Term loans amortized, current year 4,660   4,660   31,361
Term loans amortized, one year before 56,254   56,254   48,670
Term loans amortized, two years before 19,548   19,548   3,252
Term loans amortized, three years before 1,889   1,889   1,223
Term loans amortized, four years before 998   998   506
Term loans amortized, prior 2,840   2,840   2,760
Term loans amortized, revolving 18,654   18,654   15,836
Loans [2],[3] 104,843 [1],[4]   104,843 [1],[4]   103,608
Current-period gross charge-offs, current year     0   0
Current-period gross charge-offs one year before     0   0
Current-period gross charge-offs, two years before     0   0
Current-period gross charge-offs, three years before     0   0
Current-period gross charge-offs, four years before     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) (0) (0) 0
Construction and Other [Member] | Pass [Member]          
Term loans amortized, current year 4,660   4,660   31,361
Term loans amortized, one year before 56,254   56,254   48,177
Term loans amortized, two years before 19,057   19,057   2,418
Term loans amortized, three years before 1,889   1,889   1,223
Term loans amortized, four years before 998   998   506
Term loans amortized, prior 1,906   1,906   1,368
Term loans amortized, revolving 17,346   17,346   14,909
Loans 102,110   102,110   99,962
Construction and Other [Member] | Special Mention [Member]          
Term loans amortized, current year 0   0   0
Term loans amortized, one year before 0   0   0
Term loans amortized, two years before 0   0   834
Term loans amortized, three years before 0   0   0
Term loans amortized, four years before 0   0   0
Term loans amortized, prior 188   188   221
Term loans amortized, revolving 0   0   0
Loans 188   188   1,055
Construction and Other [Member] | Substandard [Member]          
Term loans amortized, current year 0   0   0
Term loans amortized, one year before 0   0   493
Term loans amortized, two years before 491   491   0
Term loans amortized, three years before 0   0   0
Term loans amortized, four years before 0   0   0
Term loans amortized, prior 746   746   1,171
Term loans amortized, revolving 1,308   1,308   927
Loans 2,545   2,545   2,591
Consumer Portfolio Segment [Member]          
Term loans amortized, current year 1,051   1,051   1,539
Term loans amortized, one year before 1,025   1,025   1,047
Term loans amortized, two years before 597   597   384
Term loans amortized, three years before 182   182   112
Term loans amortized, four years before 69   69   36
Term loans amortized, prior 2,870   2,870   3,446
Term loans amortized, revolving 0   0   0
Loans [2],[3] 5,794 [1],[4]   5,794 [1],[4]   6,564
Current-period gross charge-offs, current year     0   0
Current-period gross charge-offs one year before     0   0
Current-period gross charge-offs, two years before     0   2
Current-period gross charge-offs, three years before     0   6
Current-period gross charge-offs, four years before     0   0
Current-period gross charge-offs, prior     44   30
Current-period gross charge-offs, revolving     0   0
Current-period gross charge-offs, total (0) $ 5 44 $ 11 38
Consumer Portfolio Segment [Member] | Pass [Member]          
Term loans amortized, current year 1,051   1,051   1,539
Term loans amortized, one year before 1,025   1,025   1,047
Term loans amortized, two years before 597   597   381
Term loans amortized, three years before 182   182   112
Term loans amortized, four years before 69   69   36
Term loans amortized, prior 2,677   2,677   3,284
Term loans amortized, revolving 0   0   0
Loans 5,601   5,601   6,399
Consumer Portfolio Segment [Member] | Substandard [Member]          
Term loans amortized, current year 0   0   0
Term loans amortized, one year before 0   0   0
Term loans amortized, two years before 0   0   3
Term loans amortized, three years before 0   0   0
Term loans amortized, four years before 0   0   0
Term loans amortized, prior 193   193   162
Term loans amortized, revolving 0   0   0
Loans $ 193   $ 193   $ 165
[1] Accrued interest of $5.5 million and $5.5 million at June 30, 2025 and December 31, 2024, respectively, is excluded from amortized cost and presented in "accrued interest receivable and other assets" on the Consolidated Balance Sheets.
[2] Accrued interest of $5.9 million and $5.5 million at September 30, 2025 and December 31, 2024, respectively, is excluded from amortized cost and presented in "accrued interest receivable and other assets" on the Consolidated Balance Sheets.
[3] Unearned income, including net deferred loan fees and costs and unamortized premiums and discounts, totaled $6.6 million and $8.2 million at September 30, 2025 and December 31, 2024, respectively.
[4] Unearned income, including net deferred loan fees and costs and unamortized premiums and discounts, totaled $7.1 million and $8.2 million at June 30, 2025 and December 31, 2024, respectively.