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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