Note 3 - Loans Leases Receivable - Impaired Loans Leases (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Recorded investment with no specific allowance recorded	$ 6,541,033		$ 6,541,033	$ 4,637,593
Unpaid principal balance with no specific allowance recorded	6,626,249		6,626,249	4,880,273
Average recorded investment with no specific allowance recorded	6,180,109	$ 8,225,766	5,786,680
Interest income recognized with no specific allowance recorded	72,358	25,337	148,114
Interest income recognized for cash payments received with no specific allowance recorded	72,358	25,337	148,114
Recorded investment with specific allowance recorded	21,088,096		21,088,096	15,434,506
Unpaid principal balance with specific allowance recorded	21,091,935		21,091,935	15,512,477
Related allowance	4,375,091		4,375,091	3,642,968
Average recorded investment with specific allowance recorded	16,080,213	6,637,401	13,312,775
Interest income recognized with specific allowance recorded	58,827	2,961	163,995
Interest income recognized for cash payments received with specific allowance recorded	58,827	2,961	163,995
Recorded investment	27,629,129		27,629,129	20,072,099
Unpaid principal balance	27,718,184		27,718,184	20,392,750
Average recorded investment	22,260,322	14,863,167	19,099,455
Interest income recognized	131,185	28,298	312,109
Interest income recognized for cash payments received	131,185	28,298	312,109
Interest income recognized with no specific allowance recorded	72,358	25,337	148,114
Interest income recognized for cash payments received with no specific allowance recorded	72,358	25,337	148,114
Commercial Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,414,985		1,414,985	841,895
Unpaid principal balance with no specific allowance recorded	1,425,422		1,425,422	951,600
Average recorded investment with no specific allowance recorded	1,301,977	1,677,527	1,129,388
Interest income recognized with no specific allowance recorded	25,816	3,301	42,567
Interest income recognized for cash payments received with no specific allowance recorded	25,816	3,301	42,567
Recorded investment with specific allowance recorded	5,152,924		5,152,924	8,094,556
Unpaid principal balance with specific allowance recorded	5,156,763		5,156,763	8,098,395
Related allowance	1,062,424		1,062,424	1,771,537
Average recorded investment with specific allowance recorded	5,157,671	4,188,621	4,994,557
Interest income recognized with specific allowance recorded	53,127		150,848
Interest income recognized for cash payments received with specific allowance recorded	53,127		150,848
Recorded investment	6,567,909		6,567,909	8,936,451
Unpaid principal balance	6,582,185		6,582,185	9,049,995
Average recorded investment	6,459,648	5,866,148	6,123,945
Interest income recognized	78,943	3,301	193,415
Interest income recognized for cash payments received	78,943	3,301	193,415
Interest income recognized with no specific allowance recorded	25,816	3,301	42,567
Interest income recognized for cash payments received with no specific allowance recorded	25,816	3,301	42,567
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	107,322		107,322
Unpaid principal balance with no specific allowance recorded	107,322		107,322	93,774
Average recorded investment with no specific allowance recorded	53,661	767,032	26,831
Interest income recognized with no specific allowance recorded	6,783		6,783
Interest income recognized for cash payments received with no specific allowance recorded	6,783		6,783
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	51,520		51,520	57,398
Average recorded investment with specific allowance recorded	155,020	363,911	238,584
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Recorded investment	262,342		262,342	322,148
Unpaid principal balance	262,342		262,342	415,922
Average recorded investment	208,681	1,130,943	265,415
Interest income recognized	6,783		6,783
Interest income recognized for cash payments received	6,783		6,783
Interest income recognized with no specific allowance recorded	6,783		6,783
Interest income recognized for cash payments received with no specific allowance recorded	6,783		6,783
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
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	4,344,742		4,344,742	4,353,817
Unpaid principal balance with specific allowance recorded	4,344,742		4,344,742	4,353,817
Related allowance	818,536		818,536	577,611
Average recorded investment with specific allowance recorded	4,345,880	187,831	4,348,711
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Recorded investment	4,344,742		4,344,742	4,353,817
Unpaid principal balance	4,344,742		4,344,742	4,353,817
Average recorded investment	4,345,880	187,831	4,348,711
Interest income recognized
Interest income recognized for cash payments received
Interest income recognized with no specific allowance recorded
Interest income recognized for cash payments received with no specific allowance recorded
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	1,198,439		1,198,439	1,196,549
Unpaid principal balance with no specific allowance recorded	1,198,439		1,198,439	1,196,549
Average recorded investment with no specific allowance recorded	1,173,629	1,969,034	1,178,032
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	9,783,406		9,783,406	239,600
Unpaid principal balance with specific allowance recorded	9,783,406		9,783,406	239,600
Related allowance	1,504,252		1,504,252	58,910
Average recorded investment with specific allowance recorded	4,929,960	135,141	2,464,981
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Recorded investment	10,981,845		10,981,845	1,436,149
Unpaid principal balance	10,981,845		10,981,845	1,436,149
Average recorded investment	6,103,589	2,104,175	3,643,013
Interest income recognized
Interest income recognized for cash payments received
Interest income recognized with no specific allowance recorded
Interest income recognized for cash payments received with no specific allowance recorded
Finance Leases Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	2,971,485		2,971,485	1,690,121
Unpaid principal balance with no specific allowance recorded	2,971,485		2,971,485	1,690,121
Average recorded investment with no specific allowance recorded	2,820,518	2,008,095	2,708,433
Interest income recognized with no specific allowance recorded	39,759	21,095	97,603
Interest income recognized for cash payments received with no specific allowance recorded	39,759	21,095	97,603
Recorded investment with specific allowance recorded	980,705		980,705	1,566,143
Unpaid principal balance with specific allowance recorded	980,705		980,705	1,566,143
Related allowance	652,775		652,775	848,919
Average recorded investment with specific allowance recorded	893,042	793,769	736,537
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Recorded investment	3,952,190		3,952,190	3,256,264
Unpaid principal balance	3,952,190		3,952,190	3,256,264
Average recorded investment	3,713,560	2,801,864	3,444,970
Interest income recognized	39,759	21,095	97,603
Interest income recognized for cash payments received	39,759	21,095	97,603
Interest income recognized with no specific allowance recorded	39,759	21,095	97,603
Interest income recognized for cash payments received with no specific allowance recorded	39,759	21,095	97,603
Residential Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	711,098		711,098	853,294
Unpaid principal balance with no specific allowance recorded	785,877		785,877	892,495
Average recorded investment with no specific allowance recorded	690,791	1,481,340	619,466
Interest income recognized with no specific allowance recorded		941	1,161
Interest income recognized for cash payments received with no specific allowance recorded		941	1,161
Recorded investment with specific allowance recorded	617,062		617,062	807,886
Unpaid principal balance with specific allowance recorded	617,062		617,062	882,018
Related allowance	261,097		261,097	289,112
Average recorded investment with specific allowance recorded	550,476	807,827	496,243
Interest income recognized with specific allowance recorded	5,601	1,503	12,830
Interest income recognized for cash payments received with specific allowance recorded	5,601	1,503	12,830
Recorded investment	1,328,160		1,328,160	1,661,180
Unpaid principal balance	1,402,939		1,402,939	1,774,513
Average recorded investment	1,241,267	2,289,167	1,115,709
Interest income recognized	5,601	2,444	13,991
Interest income recognized for cash payments received	5,601	2,444	13,991
Interest income recognized with no specific allowance recorded		941	1,161
Interest income recognized for cash payments received with no specific allowance recorded		941	1,161
Consumer Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	137,704		137,704	55,734
Unpaid principal balance with no specific allowance recorded	137,704		137,704	55,734
Average recorded investment with no specific allowance recorded	139,533	322,738	124,530
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	54,237		54,237	50,356
Unpaid principal balance with specific allowance recorded	54,237		54,237	50,356
Related allowance	24,487		24,487	39,481
Average recorded investment with specific allowance recorded	48,164	160,301	33,162
Interest income recognized with specific allowance recorded	99	1,458	317
Interest income recognized for cash payments received with specific allowance recorded	99	1,458	317
Recorded investment	191,941		191,941	106,090
Unpaid principal balance	191,941		191,941	$ 106,090
Average recorded investment	187,697	483,039	157,692
Interest income recognized	99	1,458	317
Interest income recognized for cash payments received	99	1,458	317
Interest income recognized with no specific allowance recorded
Interest income recognized for cash payments received with no specific allowance recorded