Note 4 - Loans Leases Receivable - Impaired Loans Leases (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
Recorded investment with no specific allowance recorded	$ 9,220,714		$ 9,220,714	$ 7,117,268
Unpaid principal balance with no specific allowance recorded	9,309,769		9,309,769	7,202,484
Average recorded investment with no specific allowance recorded	6,654,324	$ 6,180,109	5,982,078
Interest income recognized with no specific allowance recorded	28,671	72,358	183,313
Interest income recognized for cash payments received with no specific allowance recorded	28,671	72,358	183,313
Recorded investment with specific allowance recorded	21,324,888		21,324,888	11,236,897
Unpaid principal balance with specific allowance recorded	21,347,964		21,347,964	11,240,836
Related allowance	9,035,501		9,035,501	3,043,319
Average recorded investment with specific allowance recorded	14,005,851	16,080,213	10,138,418
Interest income recognized with specific allowance recorded	13,475	58,827	23,490
Interest income recognized for cash payments received with specific allowance recorded	13,475	58,827	23,490
Recorded investment	30,545,602		30,545,602	18,354,163
Unpaid principal balance	30,657,733		30,657,733	18,443,318
Average recorded investment	20,660,175	22,260,322	16,120,496
Interest income recognized	42,146	131,185	206,803
Interest income recognized for cash payments received	42,146	131,185	206,803
Commercial Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	4,549,509		4,549,509	1,634,269
Unpaid principal balance with no specific allowance recorded	4,563,785		4,563,785	1,644,706
Average recorded investment with no specific allowance recorded	2,794,748	1,301,977	2,139,521
Interest income recognized with no specific allowance recorded	16,792	25,816	145,605
Interest income recognized for cash payments received with no specific allowance recorded	16,792	25,816	145,605
Recorded investment with specific allowance recorded	6,515,339		6,515,339	4,613,940
Unpaid principal balance with specific allowance recorded	6,515,339		6,515,339	4,617,879
Related allowance	4,787,321		4,787,321	715,627
Average recorded investment with specific allowance recorded	3,401,073	5,157,671	1,845,156
Interest income recognized with specific allowance recorded	1,916	53,127	5,878
Interest income recognized for cash payments received with specific allowance recorded	1,916	53,127	5,878
Recorded investment	11,064,848		11,064,848	6,248,209
Unpaid principal balance	11,079,124		11,079,124	6,262,585
Average recorded investment	6,195,821	6,459,648	3,984,677
Interest income recognized	18,708	78,943	151,483
Interest income recognized for cash payments received	18,708	78,943	151,483
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	288,409		288,409	289,261
Unpaid principal balance with no specific allowance recorded	288,409		288,409	289,261
Average recorded investment with no specific allowance recorded	288,611	53,661	288,936
Interest income recognized with no specific allowance recorded		6,783
Interest income recognized for cash payments received with no specific allowance recorded		6,783
Recorded investment with specific allowance recorded	138,201		138,201	151,962
Unpaid principal balance with specific allowance recorded	138,201		138,201	151,962
Related allowance	34,701		34,701	48,462
Average recorded investment with specific allowance recorded	140,495	155,020	145,082
Recorded investment	426,610		426,610	441,222
Unpaid principal balance	426,610		426,610	441,222
Average recorded investment	429,106	208,681	434,018
Interest income recognized		6,783
Interest income recognized for cash payments received		6,783
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Recorded investment with specific allowance recorded	5,801,618		5,801,618	4,844,312
Unpaid principal balance with specific allowance recorded	5,801,618		5,801,618	4,844,312
Related allowance	2,145,425		2,145,425	1,379,235
Average recorded investment with specific allowance recorded	5,483,757	4,345,880	5,116,524
Recorded investment	5,801,618		5,801,618	4,844,312
Unpaid principal balance	5,801,618		5,801,618	4,844,312
Average recorded investment	5,483,757	4,345,880	5,116,524
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	2,018,910		2,018,910	1,171,565
Unpaid principal balance with no specific allowance recorded	2,018,910		2,018,910	1,171,565
Average recorded investment with no specific allowance recorded	1,009,590	1,173,629	504,880
Interest income recognized with no specific allowance recorded	9,189		26,649
Interest income recognized for cash payments received with no specific allowance recorded	9,189		26,649
Recorded investment with specific allowance recorded	7,696,868		7,696,868	72,163
Unpaid principal balance with specific allowance recorded	7,696,868		7,696,868	72,163
Related allowance	1,375,703		1,375,703	1,763
Average recorded investment with specific allowance recorded	3,848,434	4,929,960	1,924,217
Interest income recognized with specific allowance recorded	8,506		8,506
Interest income recognized for cash payments received with specific allowance recorded	8,506		8,506
Recorded investment	9,715,778		9,715,778	1,243,728
Unpaid principal balance	9,715,778		9,715,778	1,243,728
Average recorded investment	4,858,024	6,103,589	2,429,097
Interest income recognized	17,695		35,155
Interest income recognized for cash payments received	17,695		35,155
Finance Leases Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,569,905		1,569,905	2,944,540
Unpaid principal balance with no specific allowance recorded	1,569,905		1,569,905	2,944,540
Average recorded investment with no specific allowance recorded	1,780,494	2,820,518	2,295,387
Interest income recognized with no specific allowance recorded	2,483	39,759	10,852
Interest income recognized for cash payments received with no specific allowance recorded	2,483	39,759	10,852
Recorded investment with specific allowance recorded	577,220		577,220	724,953
Unpaid principal balance with specific allowance recorded	577,220		577,220	724,953
Related allowance	363,439		363,439	504,469
Average recorded investment with specific allowance recorded	557,572	893,042	532,999
Recorded investment	2,147,125		2,147,125	3,669,492
Unpaid principal balance	2,147,125		2,147,125	3,669,492
Average recorded investment	2,338,066	3,713,560	2,828,386
Interest income recognized	2,483	39,759	10,852
Interest income recognized for cash payments received	2,483	39,759	10,852
Residential Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	663,167		663,167	943,388
Unpaid principal balance with no specific allowance recorded	737,946		737,946	1,018,167
Average recorded investment with no specific allowance recorded	665,567	690,791	649,064
Interest income recognized with no specific allowance recorded	207		207
Interest income recognized for cash payments received with no specific allowance recorded	207		207
Recorded investment with specific allowance recorded	484,842		484,842	761,458
Unpaid principal balance with specific allowance recorded	507,918		507,918	761,458
Related allowance	226,263		226,263	355,167
Average recorded investment with specific allowance recorded	461,398	550,476	447,006
Interest income recognized with specific allowance recorded	2,984	5,601	8,877
Interest income recognized for cash payments received with specific allowance recorded	2,984	5,601	8,877
Recorded investment	1,148,009		1,148,009	1,704,846
Unpaid principal balance	1,245,864		1,245,864	1,779,625
Average recorded investment	1,126,965	1,241,267	1,096,070
Interest income recognized	3,191	5,601	9,084
Interest income recognized for cash payments received	3,191	5,601	9,084
Consumer Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	130,814		130,814	134,245
Unpaid principal balance with no specific allowance recorded	130,814		130,814	134,245
Average recorded investment with no specific allowance recorded	115,314	139,533	104,290
Recorded investment with specific allowance recorded	110,800		110,800	68,109
Unpaid principal balance with specific allowance recorded	110,800		110,800	68,109
Related allowance	102,649		102,649	38,596
Average recorded investment with specific allowance recorded	113,122	48,164	127,434
Interest income recognized with specific allowance recorded	69	99	229
Interest income recognized for cash payments received with specific allowance recorded	69	99	229
Recorded investment	241,614		241,614	202,354
Unpaid principal balance	241,614		241,614	$ 202,354
Average recorded investment	228,436	187,697	231,724
Interest income recognized	69	99	229
Interest income recognized for cash payments received	$ 69	$ 99	$ 229