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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