Note 3 - Loans Leases Receivable - Impaired Loans Leases (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Interest income recognized with specific allowance recorded	$ 38,044	$ 3,416	$ 104,950
Interest income recognized for cash payments received with specific allowance recorded	38,044	3,416	104,950
Average recorded investment	19,520,131	11,592,924	19,249,865
Interest income recognized	86,610	27,845	180,924
Interest income recognized for cash payments received	86,610	27,845	180,924
Recorded investment	19,905,183		19,905,183	$ 20,072,099
Unpaid principal balance	199,942,388		199,942,388	20,392,750
Interest income recognized with no specific allowance recorded	48,566	24,429	75,974
Interest income recognized for cash payments received with no specific allowance recorded	48,566	24,429	75,974
Recorded investment with no specific allowance recorded	5,780,824		5,780,824	4,637,593
Unpaid principal balance with no specific allowance recorded	5,866,040		5,866,040	4,880,273
Average recorded investment with no specific allowance recorded	5,411,867	6,318,588	5,304,597
Interest income recognized with no specific allowance recorded	48,566	24,429	75,974
Interest income recognized for cash payments received with no specific allowance recorded	48,566	24,429	75,974
Recorded investment with specific allowance recorded	14,124,359		14,124,359	15,434,506
Unpaid principal balance with specific allowance recorded	14,128,198		14,128,198	15,512,477
Related allowance	3,355,720		3,355,720	3,642,968
Average recorded investment with specific allowance recorded	14,108,264	5,274,336	13,945,269
Commercial Portfolio Segment [Member]
Interest income recognized with specific allowance recorded	35,055		97,721
Interest income recognized for cash payments received with specific allowance recorded	35,055		97,721
Average recorded investment	8,872,011	4,816,539	8,732,509
Interest income recognized	44,454	3,519	114,472
Interest income recognized for cash payments received	44,454	3,519	114,472
Recorded investment	8,985,913		8,985,913	8,936,451
Unpaid principal balance	9,000,189		9,000,189	9,049,995
Interest income recognized with no specific allowance recorded	9,399	3,519	16,751
Interest income recognized for cash payments received with no specific allowance recorded	9,399	3,519	16,751
Recorded investment with no specific allowance recorded	993,551		993,551	841,895
Unpaid principal balance with no specific allowance recorded	1,003,988		1,003,988	951,600
Average recorded investment with no specific allowance recorded	805,309	2,524,056	802,367
Interest income recognized with no specific allowance recorded	9,399	3,519	16,751
Interest income recognized for cash payments received with no specific allowance recorded	9,399	3,519	16,751
Recorded investment with specific allowance recorded	7,992,362		7,992,362	8,094,556
Unpaid principal balance with specific allowance recorded	7,996,201		7,996,201	8,098,395
Related allowance	1,580,113		1,580,113	1,771,537
Average recorded investment with specific allowance recorded	8,066,702	2,292,483	7,930,142
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Average recorded investment	238,584	121,444	266,439
Interest income recognized
Interest income recognized for cash payments received
Recorded investment	155,020		155,020	322,148
Unpaid principal balance	155,020		155,020	415,922
Interest income recognized with no specific allowance recorded
Interest income recognized for cash payments received with no specific allowance recorded
Recorded investment with no specific allowance recorded
Unpaid principal balance with no specific allowance recorded				93,774
Average recorded investment with no specific allowance recorded		121,444
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	155,020		155,020	322,148
Unpaid principal balance with specific allowance recorded	155,020		155,020	322,148
Related allowance	111,520		111,520	57,398
Average recorded investment with specific allowance recorded	238,584		266,439
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Average recorded investment	4,348,142	190,174	4,350,033
Interest income recognized
Interest income recognized for cash payments received
Recorded investment	4,347,017		4,347,017	4,353,819
Unpaid principal balance	4,347,017		4,347,017	4,353,817
Interest income recognized with no specific allowance recorded
Interest income recognized for cash payments received with no specific allowance recorded
Recorded investment with no specific allowance recorded
Unpaid principal balance with no specific allowance recorded
Average recorded investment with no specific allowance recorded
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	4,347,017		4,347,017	4,353,819
Unpaid principal balance with specific allowance recorded	4,347,017		4,347,017	4,353,817
Related allowance	820,811		820,811	577,611
Average recorded investment with specific allowance recorded	4,348,142	190,174	4,350,034
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Average recorded investment	1,198,421	1,969,760	1,196,735
Interest income recognized
Interest income recognized for cash payments received
Recorded investment	1,225,337		1,225,337	1,436,149
Unpaid principal balance	1,225,337		1,225,337	1,436,149
Interest income recognized with no specific allowance recorded
Interest income recognized for cash payments received with no specific allowance recorded
Recorded investment with no specific allowance recorded	1,148,818		1,148,818	1,196,549
Unpaid principal balance with no specific allowance recorded	1,148,818		1,148,818	1,196,549
Average recorded investment with no specific allowance recorded	1,160,161	1,311,540	1,171,229
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	76,519		76,519	239,600
Unpaid principal balance with specific allowance recorded	76,519		76,519	239,600
Related allowance	6,119		6,119	58,910
Average recorded investment with specific allowance recorded	38,260	658,220	25,506
Finance Leases Portfolio Segment [Member]
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Average recorded investment	3,317,621	2,506,433	3,297,169
Interest income recognized	38,949	19,897	57,844
Interest income recognized for cash payments received	38,949	19,897	57,844
Recorded investment	3,553,173		3,553,173	3,256,262
Unpaid principal balance	3,553,173		3,553,173	3,256,264
Interest income recognized with no specific allowance recorded	38,949	19,897	57,844
Interest income recognized for cash payments received with no specific allowance recorded	38,949	19,897	57,844
Recorded investment with no specific allowance recorded	2,739,319		2,739,319	1,690,121
Unpaid principal balance with no specific allowance recorded	2,739,319		2,739,319	1,690,121
Average recorded investment with no specific allowance recorded	2,560,019	1,510,987	2,557,608
Interest income recognized with no specific allowance recorded	38,949	19,897	57,844
Interest income recognized for cash payments received with no specific allowance recorded	38,949	19,897	57,844
Recorded investment with specific allowance recorded	813,854		813,854	1,566,141
Unpaid principal balance with specific allowance recorded	813,854		813,854	1,566,143
Related allowance	550,575		550,575	848,919
Average recorded investment with specific allowance recorded	757,602	995,446	739,561
Residential Portfolio Segment [Member]
Interest income recognized with specific allowance recorded	2,989	1,948	7,229
Interest income recognized for cash payments received with specific allowance recorded	2,989	1,948	7,229
Average recorded investment	1,337,434	1,540,625	1,233,005
Interest income recognized	2,989	2,961	8,390
Interest income recognized for cash payments received	2,989	2,961	8,390
Recorded investment	1,398,615		1,398,615	1,661,180
Unpaid principal balance	1,473,393		1,473,393	1,774,513
Interest income recognized with no specific allowance recorded		1,013	1,161
Interest income recognized for cash payments received with no specific allowance recorded		1,013	1,161
Recorded investment with no specific allowance recorded	710,118		710,118	853,294
Unpaid principal balance with no specific allowance recorded	784,896		784,896	892,495
Average recorded investment with no specific allowance recorded	712,793	621,354	628,555
Interest income recognized with no specific allowance recorded		1,013	1,161
Interest income recognized for cash payments received with no specific allowance recorded		1,013	1,161
Recorded investment with specific allowance recorded	688,497		688,497	807,886
Unpaid principal balance with specific allowance recorded	688,497		688,497	882,018
Related allowance	266,217		266,217	289,112
Average recorded investment with specific allowance recorded	624,641	919,271	604,450
Consumer Portfolio Segment [Member]
Interest income recognized with specific allowance recorded		1,468
Interest income recognized for cash payments received with specific allowance recorded		1,468
Average recorded investment	207,918	447,949	173,975
Interest income recognized	218	1,468	218
Interest income recognized for cash payments received	218	1,468	218
Recorded investment	240,108		240,108	106,090
Unpaid principal balance	240,109		240,109	106,090
Interest income recognized with no specific allowance recorded	218		218
Interest income recognized for cash payments received with no specific allowance recorded	218		218
Recorded investment with no specific allowance recorded	189,018		189,018	55,734
Unpaid principal balance with no specific allowance recorded	189,019		189,019	55,734
Average recorded investment with no specific allowance recorded	173,585	229,207	144,838
Interest income recognized with no specific allowance recorded	218		218
Interest income recognized for cash payments received with no specific allowance recorded	218		218
Recorded investment with specific allowance recorded	51,090		51,090	50,356
Unpaid principal balance with specific allowance recorded	51,090		51,090	50,356
Related allowance	20,365		20,365	$ 39,481
Average recorded investment with specific allowance recorded	$ 34,333	$ 218,742	$ 29,137