Note 3 - Loans Leases Receivable - Impaired Loans Leases (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Recorded investment with no specific allowance recorded	$ 5,375,325		$ 5,375,325	$ 7,117,268
Unpaid principal balance with no specific allowance recorded	5,464,380		5,464,380	7,202,484
Average recorded investment with no specific allowance recorded	6,023,781	$ 5,411,867	6,457,254
Interest income recognized with no specific allowance recorded	67,588	48,566	159,525
Interest income recognized for cash payments received with no specific allowance recorded	67,588	48,566	159,525
Recorded investment with specific allowance recorded	7,337,070		7,337,070	11,236,897
Unpaid principal balance with specific allowance recorded	7,360,146		7,360,146	11,240,836
Related allowance	3,139,565		3,139,565	3,043,319
Average recorded investment with specific allowance recorded	7,185,239	14,108,264	6,903,756
Interest income recognized with specific allowance recorded	5,014	38,044	6,052
Interest income recognized for cash payments received with specific allowance recorded	5,014	38,044	6,052
Recorded investment	12,712,395		12,712,395	18,354,163
Unpaid principal balance	12,824,526		12,824,526	18,443,318
Average recorded investment	13,209,020	19,520,131	13,361,010
Interest income recognized	72,602	86,610	165,577
Interest income recognized for cash payments received	72,602	86,610	165,577
Commercial Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,159,577		1,159,577	1,634,269
Unpaid principal balance with no specific allowance recorded	1,173,853		1,173,853	1,644,706
Average recorded investment with no specific allowance recorded	1,400,498	805,309	1,465,402
Interest income recognized with no specific allowance recorded	59,176	9,399	138,543
Interest income recognized for cash payments received with no specific allowance recorded	59,176	9,399	138,543
Recorded investment with specific allowance recorded	391,868		391,868	4,613,940
Unpaid principal balance with specific allowance recorded	391,868		391,868	4,617,879
Related allowance	308,091		308,091	715,627
Average recorded investment with specific allowance recorded	353,153	8,066,702	327,859
Interest income recognized with specific allowance recorded	1,978	35,055
Interest income recognized for cash payments received with specific allowance recorded	1,978	35,055
Recorded investment	1,551,445		1,551,445	6,248,209
Unpaid principal balance	1,565,721		1,565,721	6,262,585
Average recorded investment	1,753,651	8,872,011	1,793,261
Interest income recognized	61,154	44,454	138,543
Interest income recognized for cash payments received	61,154	44,454	138,543
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	288,813		288,813	289,261
Unpaid principal balance with no specific allowance recorded	288,813		288,813	289,261
Average recorded investment with no specific allowance recorded	289,036		289,112
Interest income recognized with no specific allowance recorded	5,868		11,690
Interest income recognized for cash payments received with no specific allowance recorded	5,868		11,690
Recorded investment with specific allowance recorded	142,788		142,788	151,962
Unpaid principal balance with specific allowance recorded	142,788		142,788	151,962
Related allowance	39,288		39,288	48,462
Average recorded investment with specific allowance recorded	145,082	238,584	147,375
Recorded investment	431,601		431,601	441,222
Unpaid principal balance	431,601		431,601	441,222
Average recorded investment	434,118	238,584	436,487
Interest income recognized	5,868		11,690
Interest income recognized for cash payments received	5,868		11,690
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Recorded investment with specific allowance recorded	5,553,396		5,553,396	4,844,312
Unpaid principal balance with specific allowance recorded	5,553,396		5,553,396	4,844,312
Related allowance	2,070,086		2,070,086	1,379,235
Average recorded investment with specific allowance recorded	5,491,832	4,348,142	5,275,992
Recorded investment	5,553,396		5,553,396	4,844,312
Unpaid principal balance	5,553,396		5,553,396	4,844,312
Average recorded investment	5,491,832	4,348,142	5,275,992
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	982,428		982,428	1,171,565
Unpaid principal balance with no specific allowance recorded	982,428		982,428	1,171,565
Average recorded investment with no specific allowance recorded	1,105,004	1,160,161	1,151,245
Recorded investment with specific allowance recorded				72,163
Unpaid principal balance with specific allowance recorded				72,163
Related allowance				1,763
Average recorded investment with specific allowance recorded		38,260
Recorded investment	982,428		982,428	1,243,728
Unpaid principal balance	982,428		982,428	1,243,728
Average recorded investment	1,105,004	1,198,421	1,151,245
Finance Leases Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,903,173		1,903,173	2,944,540
Unpaid principal balance with no specific allowance recorded	1,903,173		1,903,173	2,944,540
Average recorded investment with no specific allowance recorded	2,198,852	2,560,019	2,551,149
Interest income recognized with no specific allowance recorded	2,544	38,949	9,292
Interest income recognized for cash payments received with no specific allowance recorded	2,544	38,949	9,292
Recorded investment with specific allowance recorded	625,831		625,831	724,953
Unpaid principal balance with specific allowance recorded	625,831		625,831	724,953
Related allowance	375,803		375,803	504,469
Average recorded investment with specific allowance recorded	566,063	757,602	521,142
Recorded investment	2,529,004		2,529,004	3,669,492
Unpaid principal balance	2,529,004		2,529,004	3,669,492
Average recorded investment	2,764,915	3,317,621	3,072,291
Interest income recognized	2,544	38,949	9,292
Interest income recognized for cash payments received	2,544	38,949	9,292
Residential Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	941,520		941,520	943,388
Unpaid principal balance with no specific allowance recorded	1,016,299		1,016,299	1,018,167
Average recorded investment with no specific allowance recorded	928,809	712,793	904,898
Recorded investment with specific allowance recorded	508,346		508,346	761,458
Unpaid principal balance with specific allowance recorded	531,422		531,422	761,458
Related allowance	239,419		239,419	355,167
Average recorded investment with specific allowance recorded	512,222	624,641	522,134
Interest income recognized with specific allowance recorded	2,959	2,989	5,893
Interest income recognized for cash payments received with specific allowance recorded	2,959	2,989	5,893
Recorded investment	1,449,866		1,449,866	1,704,846
Unpaid principal balance	1,547,721		1,547,721	1,779,625
Average recorded investment	1,441,031	1,337,434	1,427,032
Interest income recognized	2,959	2,989	5,893
Interest income recognized for cash payments received	2,959	2,989	5,893
Consumer Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	99,814		99,814	134,245
Unpaid principal balance with no specific allowance recorded	99,814		99,814	134,245
Average recorded investment with no specific allowance recorded	101,582	173,585	95,448
Interest income recognized with no specific allowance recorded		218
Interest income recognized for cash payments received with no specific allowance recorded		218
Recorded investment with specific allowance recorded	114,841		114,841	68,109
Unpaid principal balance with specific allowance recorded	114,841		114,841	68,109
Related allowance	106,878		106,878	38,596
Average recorded investment with specific allowance recorded	116,887	34,333	109,254
Interest income recognized with specific allowance recorded	76		159
Interest income recognized for cash payments received with specific allowance recorded	76		159
Recorded investment	214,655		214,655	202,354
Unpaid principal balance	214,655		214,655	$ 202,354
Average recorded investment	218,469	207,918	204,702
Interest income recognized	76	218	159
Interest income recognized for cash payments received	$ 76	$ 218	$ 159