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Note 5 - Loans - Impaired Loan Data (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unpaid contractual principal balance with no related allowance | $ 19,810,487 | $ 19,780,752 | $ 20,806,832
Impaired balance with no related allowance | 19,703,815 | 19,294,441 | 20,274,380
Average recorded investment with no related allowance | 17,644,415 | 19,502,567 | 21,505,109
Interest income recognized with no related allowance | 903,871 | 881,717 | 711,560
Interest income collected with no related allowance | 948,746 | 901,126 | 835,456
Unpaid contractual principal balance with an allowance | 4,769,466 | 6,702,602 | 10,485,323
Impaired balance with an allowance | 4,769,466 | 6,702,602 | 10,387,115
Related allowance | 1,417,731 | 1,826,684 | 3,434,772
Average recorded investment with an allowance | 6,060,541 | 7,698,030 | 9,870,840
Interest income recognized with an allowance | 169,458 | 277,753 | 289,073
Interest income collected with an allowance | 176,820 | 299,455 | 290,735
Unpaid contractual principal balance | 24,579,953 | 26,483,354 | 31,292,155
Impaired balance | 24,473,281 | 25,997,043 | 30,661,495
Average recorded investment | 23,704,956 | 27,200,597 | 31,375,949
Interest income recognized | 1,073,329 | 1,159,470 | 1,000,633
Interest income collected | 1,125,566 | 1,200,581 | 1,126,191
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 595,323 | 598,305 | 634,955
Impaired balance with no related allowance | 595,323 | 598,305 | 634,955
Average recorded investment with no related allowance | 525,463 | 633,528 | 539,099
Interest income recognized with no related allowance | 21,350 | 33,283 | 24,563
Interest income collected with no related allowance | 23,985 | 33,868 | 27,142
Unpaid contractual principal balance with an allowance | 41,762 | 0 |
Impaired balance with an allowance | 41,762 | 0 |
Related allowance | 6,264 | 0 |
Average recorded investment with an allowance | 8,352 |  | 30,270
Interest income recognized with an allowance | 2,154 | 0 |
Interest income collected with an allowance | 2,247 | 0 |
Unpaid contractual principal balance | 637,085 | 598,305 | 634,955
Impaired balance | 637,085 | 598,305 | 634,955
Average recorded investment | 533,815 | 633,528 | 569,369
Interest income recognized | 23,504 | 33,283 | 24,563
Interest income collected | 26,232 | 33,868 | 27,142
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 433,915 | 485,132 | 229,182
Impaired balance with no related allowance | 413,254 | 398,509 | 208,522
Average recorded investment with no related allowance | 382,978 | 296,578 | 210,372
Interest income recognized with no related allowance | 17,949 | 11,046 | 8,794
Interest income collected with no related allowance | 24,825 | 19,376 | 12,412
Unpaid contractual principal balance with an allowance | 0 | 0 | 0
Impaired balance with an allowance | 0 | 0 | 0
Related allowance | 0 | 0 | 0
Average recorded investment with an allowance | 0 | 0 | 0
Interest income recognized with an allowance | 0 | 0 | 0
Interest income collected with an allowance | 0 | 0 | 0
Unpaid contractual principal balance | 433,915 | 485,132 | 229,182
Impaired balance | 413,254 | 398,509 | 208,522
Average recorded investment | 382,978 | 296,578 | 210,372
Interest income recognized | 17,949 | 11,046 | 8,794
Interest income collected | 24,825 | 19,376 | 12,412
Real Estate Portfolio Segment [Member] | Commercial [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 12,163,915 | 12,637,057 | 14,357,601
Impaired balance with no related allowance | 12,163,915 | 12,637,057 | 14,276,688
Average recorded investment with no related allowance | 11,039,755 | 12,808,414 | 14,274,719
Interest income recognized with no related allowance | 581,836 | 559,601 | 567,349
Interest income collected with no related allowance | 582,893 | 549,825 | 560,354
Unpaid contractual principal balance with an allowance | 3,691,010 | 5,729,300 | 8,557,582
Impaired balance with an allowance | 3,691,010 | 5,729,300 | 8,467,135
Related allowance | 1,275,837 | 1,712,557 | 3,021,943
Average recorded investment with an allowance | 5,120,933 | 6,599,144 | 8,339,666
Interest income recognized with an allowance | 135,042 | 228,745 | 238,684
Interest income collected with an allowance | 141,978 | 237,066 | 235,749
Unpaid contractual principal balance | 15,854,925 | 18,366,357 | 22,915,183
Impaired balance | 15,854,925 | 18,366,357 | 22,743,823
Average recorded investment | 16,160,688 | 19,407,558 | 22,614,385
Interest income recognized | 716,878 | 788,346 | 806,033
Interest income collected | 724,871 | 786,891 | 796,103
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 132,366 | 54,306 | 190,494
Impaired balance with no related allowance | 132,366 | 54,306 | 190,494
Average recorded investment with no related allowance | 69,396 | 141,396 | 697,893
Interest income recognized with no related allowance | 7,806 | 3,526 | 6,630
Interest income collected with no related allowance | 7,966 | 3,836 | 7,127
Unpaid contractual principal balance with an allowance | 398,930 | 493,067 | 72,296
Impaired balance with an allowance | 398,930 | 493,067 | 72,296
Related allowance | 38,930 | 65,635 | 21,135
Average recorded investment with an allowance | 465,929 | 241,063 | 74,098
Interest income recognized with an allowance | 0 | 22,626 | 1,532
Interest income collected with an allowance | 0 | 32,922 | 1,416
Unpaid contractual principal balance | 531,296 | 547,373 | 262,790
Impaired balance | 531,296 | 547,373 | 262,790
Average recorded investment | 535,325 | 382,459 | 771,991
Interest income recognized | 7,806 | 26,152 | 8,162
Interest income collected | 7,966 | 36,758 | 8,543
Real Estate Portfolio Segment [Member] | Residential Construction [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 0 | 0 |
Impaired balance with no related allowance | 0 | 0 |
Average recorded investment with no related allowance | 0 | 79,295 |
Interest income recognized with no related allowance | 0 | 0 |
Interest income collected with no related allowance | 0 | 0 |
Unpaid contractual principal balance with an allowance | 0 | 0 |
Impaired balance with an allowance | 0 | 0 |
Related allowance | 0 | 0 |
Average recorded investment with an allowance | 0 | 0 |
Interest income recognized with an allowance | 0 | 0 |
Interest income collected with an allowance | 0 | 0 |
Unpaid contractual principal balance | 0 | 0 |
Impaired balance | 0 | 0 |
Average recorded investment | 0 | 79,295 |
Interest income recognized | 0 | 0 |
Interest income collected | 0 | 0 |
Real Estate Portfolio Segment [Member] | Residential [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 4,214,354 | 4,977,769 | 4,261,558
Impaired balance with no related allowance | 4,129,876 | 4,579,614 | 3,952,139
Average recorded investment with no related allowance | 4,067,529 | 4,566,041 | 4,553,322
Interest income recognized with no related allowance | 208,138 | 211,318 | 73,099
Interest income collected with no related allowance | 212,509 | 226,684 | 190,373
Unpaid contractual principal balance with an allowance | 274,198 | 108,859 | 1,475,594
Impaired balance with an allowance | 274,198 | 108,859 | 1,467,833
Related allowance | 60,716 | 27,123 | 362,521
Average recorded investment with an allowance | 97,902 | 482,228 | 1,042,750
Interest income recognized with an allowance | 8,187 | 4,261 | 27,759
Interest income collected with an allowance | 8,180 | 7,446 | 32,260
Unpaid contractual principal balance | 4,488,552 | 5,086,628 | 5,737,152
Impaired balance | 4,404,074 | 4,688,473 | 5,419,972
Average recorded investment | 4,165,431 | 5,048,269 | 5,596,072
Interest income recognized | 216,325 | 215,579 | 100,858
Interest income collected | 220,689 | 234,130 | 222,633
Real Estate Portfolio Segment [Member] | Farmland [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 2,054,137 | 840,110 | 920,666
Impaired balance with no related allowance | 2,052,604 | 838,577 | 799,556
Average recorded investment with no related allowance | 1,361,278 | 790,967 | 1,016,395
Interest income recognized with no related allowance | 52,974 | 54,367 | 21,526
Interest income collected with no related allowance | 81,962 | 58,085 | 26,012
Unpaid contractual principal balance with an allowance | 363,566 | 371,376 | 379,851
Impaired balance with an allowance | 363,566 | 371,376 | 379,851
Related allowance | 35,984 | 21,369 | 29,173
Average recorded investment with an allowance | 367,425 | 375,595 | 384,056
Interest income recognized with an allowance | 24,075 | 22,121 | 21,098
Interest income collected with an allowance | 24,415 | 22,021 | 21,310
Unpaid contractual principal balance | 2,417,703 | 1,211,486 | 1,300,517
Impaired balance | 2,416,170 | 1,209,953 | 1,179,407
Average recorded investment | 1,728,703 | 1,166,562 | 1,400,451
Interest income recognized | 77,049 | 76,488 | 42,624
Interest income collected | 106,377 | 80,106 | 47,322
Consumer and Other Portfolio Segment [Member] | Consumer [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 212,524 | 188,073 | 212,376
Impaired balance with no related allowance | 212,524 | 188,073 | 212,026
Average recorded investment with no related allowance | 197,225 | 186,348 | 213,309
Interest income recognized with no related allowance | 13,614 | 8,576 | 9,599
Interest income collected with no related allowance | 14,373 | 9,452 | 12,036
Unpaid contractual principal balance with an allowance | 0 | 0 | 0
Impaired balance with an allowance | 0 | 0 | 0
Related allowance | 0 | 0 | 0
Average recorded investment with an allowance | 0 | 0 | 0
Interest income recognized with an allowance | 0 | 0 | 0
Interest income collected with an allowance | 0 | 0 | 0
Unpaid contractual principal balance | 212,524 | 188,073 | 212,376
Impaired balance | 212,524 | 188,073 | 212,026
Average recorded investment | 197,225 | 186,348 | 213,309
Interest income recognized | 13,614 | 8,576 | 9,599
Interest income collected | 14,373 | $ 9,452 | $ 12,036
Consumer and Other Portfolio Segment [Member] | Other [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 3,953 |  |
Impaired balance with no related allowance | 3,953 |  |
Average recorded investment with no related allowance | 791 |  |
Interest income recognized with no related allowance | 204 |  |
Interest income collected with no related allowance | 233 |  |
Unpaid contractual principal balance with an allowance | 0 |  |
Impaired balance with an allowance | 0 |  |
Related allowance | 0 |  |
Average recorded investment with an allowance | 0 |  |
Interest income recognized with an allowance |  |  |
Interest income collected with an allowance | 0 |  |
Unpaid contractual principal balance | 3,953 |  |
Impaired balance | 3,953 |  |
Average recorded investment | 791 |  |
Interest income recognized | 204 |  |
Interest income collected | $ 233 |  |

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