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Note 7 - Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Balance $ 138,439,701 $ 136,343,646 $ 137,289,160 $ 137,173,203
Total other comprehensive income 1,617,141 1,134,044 1,671,659 1,616,979
Balance 140,693,377 136,939,757 140,693,377 136,939,757
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Balance (3,598,212) (6,676,939) (4,005,169) (6,639,506)
Other comprehensive (loss) income before reclassification 1,737,976 2,070,862 2,144,933 2,033,429
Amounts reclassified 0 0 0 0
Total other comprehensive income 1,737,976 2,070,862 2,144,933 2,033,429
Balance (1,860,236) (4,606,077) (1,860,236) (4,606,077)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Balance 69,388 5,654 (60,526) 2,549
Other comprehensive (loss) income before reclassification 0 0 0 0
Amounts reclassified 0 0 129,914 3,105
Total other comprehensive income 0 0 129,914 3,105
Balance 69,388 5,654 69,388 5,654
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (14,106) 689,446 468,247 172,183
Other comprehensive (loss) income before reclassification (120,835) (936,818) (603,188) (419,555)
Amounts reclassified 0 0 0 0
Total other comprehensive income (120,835) (936,818) (603,188) (419,555)
Balance (134,941) (247,372) (134,941) (247,372)
AOCI Attributable to Parent [Member]        
Balance (3,542,930) (5,981,839) (3,597,448) (6,464,774)
Other comprehensive (loss) income before reclassification 1,617,141 1,134,044 1,541,745 1,613,874
Amounts reclassified 0 0 129,914 3,105
Total other comprehensive income 1,617,141 1,134,044 1,671,659 1,616,979
Balance $ (1,925,789) $ (4,847,795) $ (1,925,789) $ (4,847,795)