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Note 4 - Loans Leases Receivable - Impaired Loans Leases (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Recorded investment with no specific allowance recorded | $ 7,117,268 | $ 4,637,593 | $ 3,932,541
Unpaid principal balance with no specific allowance recorded | 7,202,484 | 4,880,273 | 4,402,147
Average recorded investment with no specific allowance recorded | 6,354,341 | 7,510,986 | 6,656,069
Interest income recognized with no specific allowance recorded | 216,413 | 74,587 | 25,070
Interest income recognized for cash payments received with no specific allowance recorded | 216,413 | 74,587 | 25,070
Recorded investment with specific allowance recorded | 11,236,897 | 15,434,506 | 7,090,846
Unpaid principal balance with specific allowance recorded | 11,240,836 | 15,512,479 | 7,106,685
Related allowance | 3,043,319 | 3,642,968 | 3,304,287
Average recorded investment with specific allowance recorded | 10,512,445 | 5,870,942 | 6,383,114
Interest income recognized with specific allowance recorded | 218,621 | 66,247 | 13,606
Interest income recognized for cash payments received with specific allowance recorded | 218,621 | 66,247 | 13,606
Recorded investment | 18,354,163 | 20,072,099 | 11,023,387
Unpaid principal balance | 18,443,318 | 20,392,752 | 11,508,832
Average recorded investment | 16,866,786 | 13,381,928 | 13,039,183
Interest income recognized | 435,034 | 140,834 | 38,676
Interest income recognized for cash payments received | 435,034 | 140,834 | 38,676
Commercial Portfolio Segment [Member] |  |  |
Recorded investment with no specific allowance recorded | 1,634,269 | 841,895 | 234,636
Unpaid principal balance with no specific allowance recorded | 1,644,706 | 951,600 | 346,072
Average recorded investment with no specific allowance recorded | 1,406,310 | 2,858,343 | 380,495
Interest income recognized with no specific allowance recorded | 71,183 | 16,748 | 7,436
Interest income recognized for cash payments received with no specific allowance recorded | 71,183 | 16,748 | 7,436
Recorded investment with specific allowance recorded | 4,613,940 | 8,094,556 | 5,051,846
Unpaid principal balance with specific allowance recorded | 4,617,879 | 8,098,395 | 5,055,685
Related allowance | 715,627 | 1,771,537 | 2,592,270
Average recorded investment with specific allowance recorded | 4,584,142 | 2,959,495 | 4,811,046
Interest income recognized with specific allowance recorded | 203,221 | 17,742 |
Interest income recognized for cash payments received with specific allowance recorded | 203,221 | 17,742 |
Recorded investment | 6,248,209 | 8,936,451 | 5,286,482
Unpaid principal balance | 6,262,585 | 9,049,995 | 5,401,757
Average recorded investment | 5,990,452 | 5,817,838 | 5,191,541
Interest income recognized | 274,404 | 34,490 | 7,436
Interest income recognized for cash payments received | 274,404 | 34,490 | 7,436
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Recorded investment with no specific allowance recorded | 289,261 |  | 256,761
Unpaid principal balance with no specific allowance recorded | 289,261 | 93,774 | 350,535
Average recorded investment with no specific allowance recorded | 79,317 | 312,242 | 447,144
Interest income recognized with no specific allowance recorded | 11,902 |  |
Interest income recognized for cash payments received with no specific allowance recorded | 11,902 |  |
Recorded investment with specific allowance recorded | 151,962 | 322,148 |
Unpaid principal balance with specific allowance recorded | 151,962 | 322,148 |
Related allowance | 48,462 | 57,398 |
Average recorded investment with specific allowance recorded | 221,260 | 385,269 |
Interest income recognized with specific allowance recorded |  |  |
Interest income recognized for cash payments received with specific allowance recorded |  |  |
Recorded investment | 441,222 | 322,148 | 256,761
Unpaid principal balance | 441,222 | 415,922 | 350,535
Average recorded investment | 300,577 | 697,511 | 447,144
Interest income recognized | 11,902 |  |
Interest income recognized for cash payments received | 11,902 |  |
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |
Recorded investment with no specific allowance recorded |  |  |
Unpaid principal balance with no specific allowance recorded |  |  | 228,818
Average recorded investment with no specific allowance recorded |  |  | 117,406
Interest income recognized with no specific allowance recorded |  |  |
Interest income recognized for cash payments received with no specific allowance recorded |  |  |
Recorded investment with specific allowance recorded | 4,844,312 | 4,353,817 | 193,804
Unpaid principal balance with specific allowance recorded | 4,844,312 | 4,353,819 | 205,804
Related allowance | 1,379,235 | 577,611 | 76,934
Average recorded investment with specific allowance recorded | 4,447,831 | 1,022,930 | 195,986
Interest income recognized with specific allowance recorded |  |  |
Interest income recognized for cash payments received with specific allowance recorded |  |  |
Recorded investment | 4,844,312 | 4,353,817 | 193,804
Unpaid principal balance | 4,844,312 | 4,353,819 | 434,622
Average recorded investment | 4,447,831 | 1,022,930 | 313,392
Interest income recognized |  |  |
Interest income recognized for cash payments received |  |  |
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |
Recorded investment with no specific allowance recorded | 1,171,565 | 1,196,549 | 1,578,470
Unpaid principal balance with no specific allowance recorded | 1,171,565 | 1,196,549 | 1,578,470
Average recorded investment with no specific allowance recorded | 1,176,738 | 1,322,654 | 2,953,888
Interest income recognized with no specific allowance recorded |  |  |
Interest income recognized for cash payments received with no specific allowance recorded |  |  |
Recorded investment with specific allowance recorded | 72,163 | 239,600 |
Unpaid principal balance with specific allowance recorded | 72,163 | 239,600 |
Related allowance | 1,763 | 58,910 |
Average recorded investment with specific allowance recorded | 44,667 | 47,920 |
Interest income recognized with specific allowance recorded |  |  |
Interest income recognized for cash payments received with specific allowance recorded |  |  |
Recorded investment | 1,243,728 | 1,436,149 | 1,578,470
Unpaid principal balance | 1,243,728 | 1,436,149 | 1,578,470
Average recorded investment | 1,221,405 | 1,370,574 | 2,953,888
Interest income recognized |  |  |
Interest income recognized for cash payments received |  |  |
Finance Leases Portfolio Segment [Member] |  |  |
Recorded investment with no specific allowance recorded | 2,944,540 | 1,690,121 | 871,884
Unpaid principal balance with no specific allowance recorded | 2,944,540 | 1,690,121 | 871,884
Average recorded investment with no specific allowance recorded | 2,879,695 | 1,731,982 | 892,281
Interest income recognized with no specific allowance recorded | 132,167 | 43,461 | 4,142
Interest income recognized for cash payments received with no specific allowance recorded | 132,167 | 43,461 | 4,142
Recorded investment with specific allowance recorded | 724,953 | 1,566,143 | 829,457
Unpaid principal balance with specific allowance recorded | 724,953 | 1,566,143 | 829,457
Related allowance | 504,469 | 848,919 | 306,193
Average recorded investment with specific allowance recorded | 625,107 | 841,733 | 474,458
Interest income recognized with specific allowance recorded |  | 36,303 |
Interest income recognized for cash payments received with specific allowance recorded |  | 36,303 |
Recorded investment | 3,669,492 | 3,256,264 | 1,701,341
Unpaid principal balance | 3,669,492 | 3,256,264 | 1,701,341
Average recorded investment | 3,504,802 | 2,573,715 | 1,366,739
Interest income recognized | 132,167 | 79,764 | 4,142
Interest income recognized for cash payments received | 132,167 | 79,764 | 4,142
Residential Portfolio Segment [Member] |  |  |
Recorded investment with no specific allowance recorded | 943,388 | 853,294 | 613,486
Unpaid principal balance with no specific allowance recorded | 1,018,167 | 892,495 | 649,064
Average recorded investment with no specific allowance recorded | 685,807 | 964,590 | 1,047,001
Interest income recognized with no specific allowance recorded | 1,161 | 9,903 | 3,929
Interest income recognized for cash payments received with no specific allowance recorded | 1,161 | 9,903 | 3,929
Recorded investment with specific allowance recorded | 761,458 | 807,886 | 805,301
Unpaid principal balance with specific allowance recorded | 761,458 | 882,018 | 805,301
Related allowance | 355,167 | 289,112 | 185,801
Average recorded investment with specific allowance recorded | 549,286 | 573,211 | 712,085
Interest income recognized with specific allowance recorded | 14,990 | 11,675 | 7,913
Interest income recognized for cash payments received with specific allowance recorded | 14,990 | 11,675 | 7,913
Recorded investment | 1,704,846 | 1,661,180 | 1,418,787
Unpaid principal balance | 1,779,625 | 1,774,513 | 1,454,365
Average recorded investment | 1,235,093 | 1,537,801 | 1,759,086
Interest income recognized | 16,151 | 21,578 | 11,842
Interest income recognized for cash payments received | 16,151 | 21,578 | 11,842
Consumer Portfolio Segment [Member] |  |  |
Recorded investment with no specific allowance recorded | 134,245 | 55,734 | 377,304
Unpaid principal balance with no specific allowance recorded | 134,245 | 55,734 | 377,304
Average recorded investment with no specific allowance recorded | 126,474 | 321,175 | 817,854
Interest income recognized with no specific allowance recorded |  | 4,475 | 9,563
Interest income recognized for cash payments received with no specific allowance recorded |  | 4,475 | 9,563
Recorded investment with specific allowance recorded | 68,109 | 50,356 | 210,438
Unpaid principal balance with specific allowance recorded | 68,109 | 50,356 | 210,438
Related allowance | 38,596 | 39,481 | 143,089
Average recorded investment with specific allowance recorded | 40,152 | 40,384 | 189,539
Interest income recognized with specific allowance recorded | 410 | 527 | 5,693
Interest income recognized for cash payments received with specific allowance recorded | 410 | 527 | 5,693
Recorded investment | 202,354 | 106,090 | 587,742
Unpaid principal balance | 202,354 | 106,090 | 587,742
Average recorded investment | 166,626 | 361,559 | 1,007,393
Interest income recognized | 410 | 5,002 | 15,256
Interest income recognized for cash payments received | $ 410 | $ 5,002 | $ 15,256

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