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Note 4 - Loans - Impaired Loan Data (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unpaid contractual principal balance with no related allowance | $ 19,780,752 | $ 20,806,832 | $ 29,820,855
Impaired balance with no related allowance | 19,294,441 | 20,274,380 | 23,508,793
Average recorded investment with no related allowance | 19,502,567 | 21,505,109 | 25,289,234
Interest income recognized with no related allowance | 881,717 | 711,560 | 752,278
Interest income collected with no related allowance | 901,126 | 835,456 | 765,424
Unpaid contractual principal balance with an allowance | 6,702,602 | 10,485,323 | 10,639,996
Impaired balance with an allowance | 6,702,602 | 10,387,115 | 10,618,411
Related allowance | 1,826,684 | 3,434,772 | 2,073,418
Average recorded investment with an allowance | 7,698,030 | 9,870,840 | 8,344,476
Interest income recognized with an allowance | 277,753 | 289,073 | 253,603
Interest income collected with an allowance | 299,455 | 290,735 | 248,297
Unpaid contractual principal balance | 26,483,354 | 31,292,155 | 40,460,851
Impaired balance | 25,997,043 | 30,661,495 | 34,127,204
Average recorded investment | 27,200,597 | 31,375,949 | 33,633,710
Interest income recognized | 1,159,470 | 1,000,633 | 1,005,881
Interest income collected | 1,200,581 | 1,126,191 | 1,013,721
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 598,305 | 634,955 | 454,423
Impaired balance with no related allowance | 598,305 | 634,955 | 454,013
Average recorded investment with no related allowance | 633,528 | 539,099 | 534,814
Interest income recognized with no related allowance | 33,283 | 24,563 | 17,259
Interest income collected with no related allowance | 33,868 | 27,142 | 21,253
Unpaid contractual principal balance with an allowance | 0 | 0 | 122,928
Impaired balance with an allowance | 0 | 0 | 122,928
Related allowance | 0 | 0 | 94,538
Average recorded investment with an allowance | 0 | 30,270 | 99,749
Interest income recognized with an allowance | 0 | 0 | 2,275
Interest income collected with an allowance | 0 | 0 | 2,438
Unpaid contractual principal balance | 598,305 | 634,955 | 577,351
Impaired balance | 598,305 | 634,955 | 576,941
Average recorded investment | 633,528 | 569,369 | 634,563
Interest income recognized | 33,283 | 24,563 | 19,534
Interest income collected | 33,868 | 27,142 | 23,691
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 485,132 | 229,182 | 195,654
Impaired balance with no related allowance | 398,509 | 208,522 | 178,021
Average recorded investment with no related allowance | 296,578 | 210,372 | 163,078
Interest income recognized with no related allowance | 11,046 | 8,794 | (9,957)
Interest income collected with no related allowance | 19,376 | 12,412 | 10,334
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 | 485,132 | 229,182 | 195,654
Impaired balance | 398,509 | 208,522 | 178,021
Average recorded investment | 296,578 | 210,372 | 163,078
Interest income recognized | 11,046 | 8,794 | (9,957)
Interest income collected | 19,376 | 12,412 | 10,334
Real Estate Portfolio Segment [Member] | Commercial [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 12.637057 | 14,357,601 | 15,569,340
Impaired balance with no related allowance | 12,637,057 | 14,276,688 | 15,122,486
Average recorded investment with no related allowance | 12,808,414 | 14,274,719 | 15,430,252
Interest income recognized with no related allowance | 559,601 | 567,349 | 529,376
Interest income collected with no related allowance | 549,825 | 560,354 | 530,699
Unpaid contractual principal balance with an allowance | 5,729,300 | 8,557,582 | 8,969,329
Impaired balance with an allowance | 5,729,300 | 8,467,135 | 8,955,503
Related allowance | 1,712,557 | 3,021,943 | 1,607,962
Average recorded investment with an allowance | 6,599,144 | 8,339,666 | 6,673,087
Interest income recognized with an allowance | 228,745 | 238,684 | 213,693
Interest income collected with an allowance | 237,066 | 235,749 | 208,657
Unpaid contractual principal balance | 18,366,357 | 22,915,183 | 24,538,669
Impaired balance | 18,366,357 | 22,743,823 | 24,077,989
Average recorded investment | 19,407,558 | 22,614,385 | 22,103,339
Interest income recognized | 788,346 | 806,033 | 743,069
Interest income collected | 786,891 | 796,103 | 739,356
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 54,306 | 190,494 | 6,887,522
Impaired balance with no related allowance | 54,306 | 190,494 | 1,896,938
Average recorded investment with no related allowance | 141,396 | 697,893 | 2,867,061
Interest income recognized with no related allowance | 3,526 | 6,630 | 25,788
Interest income collected with no related allowance | 3,836 | 7,127 | 27,007
Unpaid contractual principal balance with an allowance | 493,067 | 72,296 | 76,644
Impaired balance with an allowance | 493,067 | 72,296 | 76,644
Related allowance | 65,635 | 21,135 | 25,344
Average recorded investment with an allowance | 241,063 | 74,098 | 92,200
Interest income recognized with an allowance | 22,626 | 1,532 | 375
Interest income collected with an allowance | 32,922 | 1,416 | 375
Unpaid contractual principal balance | 547,373 | 262,790 | 6,964,166
Impaired balance | 547,373 | 262,790 | 1,973,582
Average recorded investment | 382,459 | 771,991 | 2,959,261
Interest income recognized | 26,152 | 8,162 | 26,163
Interest income collected | 36,758 | 8,543 | 27,382
Real Estate Portfolio Segment [Member] | Residential Construction [Member] |  |  |
Unpaid contractual principal balance with no related allowance |  |  |
Impaired balance with no related allowance |  |  |
Average recorded investment with no related allowance | 79,295 |  |
Interest income recognized with no related allowance |  |  |
Interest income collected with no related allowance |  |  |
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 | 0 |  |
Interest income collected with an allowance | 0 |  |
Unpaid contractual principal balance |  |  |
Impaired balance |  |  |
Average recorded investment | 79,295 |  |
Interest income recognized |  |  |
Interest income collected |  |  |
Real Estate Portfolio Segment [Member] | Residential [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 4,977,769 | 4,261,558 | 5,429,121
Impaired balance with no related allowance | 4,579,614 | 3,952,139 | 4,575,547
Average recorded investment with no related allowance | 4,566,041 | 4,553,322 | 4,715,162
Interest income recognized with no related allowance | 211,318 | 73,099 | 175,484
Interest income collected with no related allowance | 226,684 | 190,373 | 159,148
Unpaid contractual principal balance with an allowance | 108,859 | 1,475,594 | 1,083,127
Impaired balance with an allowance | 108,859 | 1,467,833 | 1,075,367
Related allowance | 27,123 | 362,521 | 308,188
Average recorded investment with an allowance | 482,228 | 1,042,750 | 1,088,380
Interest income recognized with an allowance | 4,261 | 27,759 | 16,380
Interest income collected with an allowance | 7,446 | 32,260 | 15,873
Unpaid contractual principal balance | 5,086,628 | 5,737,152 | 6,512,248
Impaired balance | 4,688,473 | 5,419,972 | 5,650,914
Average recorded investment | 5,048,269 | 5,596,072 | 5,803,542
Interest income recognized | 215,579 | 100,858 | 191,864
Interest income collected | 234,130 | 222,633 | 175,021
Real Estate Portfolio Segment [Member] | Farmland [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 840,110 | 920,666 | 1,104,887
Impaired balance with no related allowance | 838,577 | 799,556 | 1,103,353
Average recorded investment with no related allowance | 790,967 | 1,016,395 | 1,339,863
Interest income recognized with no related allowance | 54,367 | 21,526 | 583
Interest income collected with no related allowance | 58,085 | 26,012 | 2,076
Unpaid contractual principal balance with an allowance | 371,376 | 379,851 | 387,968
Impaired balance with an allowance | 371,376 | 379,851 | 387,969
Related allowance | 21,369 | 29,173 | 37,386
Average recorded investment with an allowance | 375,595 | 384,056 | 391,060
Interest income recognized with an allowance | 22,121 | 21,098 | 20,880
Interest income collected with an allowance | 22,021 | 21,310 | 20,954
Unpaid contractual principal balance | 1,211,486 | 1,300,517 | 1,492,855
Impaired balance | 1,209,953 | 1,179,407 | 1,491,322
Average recorded investment | 1,166,562 | 1,400,451 | 1,730,923
Interest income recognized | 76,488 | 42,624 | 21,463
Interest income collected | 80,106 | 47,322 | 23,030
Consumer and Other Portfolio Segment [Member] | Consumer [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 188,073 | 212,376 | 179,908
Impaired balance with no related allowance | 188,073 | 212,026 | 178,435
Average recorded investment with no related allowance | 186,348 | 213,309 | 190,566
Interest income recognized with no related allowance | 8,576 | 9,599 | 13,745
Interest income collected with no related allowance | 9,452 | 12,036 | 14,907
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 | 188,073 | 212,376 | 179,908
Impaired balance | 188,073 | 212,026 | 178,435
Average recorded investment | 186,348 | 213,309 | 190,566
Interest income recognized | 8,576 | 9,599 | 13,745
Interest income collected | $ 9,452 | $ 12,036 | 14,907
Consumer and Other Portfolio Segment [Member] | Other [Member] |  |  |
Unpaid contractual principal balance with no related allowance |  |  | 0
Impaired balance with no related allowance |  |  | 0
Average recorded investment with no related allowance |  |  | 48,438
Interest income recognized with no related allowance |  |  | 0
Interest income collected with no related allowance |  |  | 0
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 |  |  | 0
Interest income collected with an allowance |  |  | 0
Unpaid contractual principal balance |  |  | 0
Impaired balance |  |  | 0
Average recorded investment |  |  | 48,438
Interest income recognized |  |  | 0
Interest income collected |  |  | $ 0

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