Note 3 - Loans Leases Receivable - Impaired Loans Leases (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Recorded investment with no specific allowance recorded	$ 4,926,710	$ 3,989,038	$ 4,637,593
Unpaid principal balance with no specific allowance recorded	5,011,928	4,312,955	4,880,273
Average recorded investment with no specific allowance recorded	5,121,057	4,112,488
Interest income recognized with no specific allowance recorded	27,408	14,465
Interest income recognized for cash payments received with no specific allowance recorded	27,408	14,465
Recorded investment with specific allowance recorded	15,273,374	7,334,741	15,434,506
Unpaid principal balance with specific allowance recorded	15,277,213	7,386,158	15,512,477
Related allowance	3,748,557	3,179,854	3,642,968
Average recorded investment with specific allowance recorded	14,810,049	7,056,097
Interest income recognized with specific allowance recorded	67,018	3,458
Interest income recognized for cash payments received with specific allowance recorded	67,018	3,458
Recorded investment	20,200,084	11,323,779	20,072,099
Unpaid principal balance	20,289,141	11,699,113	20,392,750
Average recorded investment	19,931,106	11,168,585
Interest income recognized	94,426	17,923
Interest income recognized for cash payments received	94,426	17,923
Commercial Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	835,955	286,508	841,895
Unpaid principal balance with no specific allowance recorded	846,392	477,450	951,600
Average recorded investment with no specific allowance recorded	927,387	347,369
Interest income recognized with no specific allowance recorded	7,352	1,824
Interest income recognized for cash payments received with no specific allowance recorded	7,352	1,824
Recorded investment with specific allowance recorded	8,352,499	4,891,938	8,094,556
Unpaid principal balance with specific allowance recorded	8,356,338	4,895,777	8,098,395
Related allowance	1,751,774	2,168,454	1,771,537
Average recorded investment with specific allowance recorded	8,110,658	4,885,096
Interest income recognized with specific allowance recorded	62,666
Interest income recognized for cash payments received with specific allowance recorded	62,666
Recorded investment	9,188,454	5,178,446	8,936,451
Unpaid principal balance	9,202,730	5,373,227	9,049,995
Average recorded investment	9,038,045	5,232,465
Interest income recognized	70,018	1,824
Interest income recognized for cash payments received	70,018	1,824
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded		242,887
Unpaid principal balance with no specific allowance recorded		336,661	93,774
Average recorded investment with no specific allowance recorded		244,824
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	322,148		322,148
Unpaid principal balance with specific allowance recorded	322,148		322,148
Related allowance	57,398		57,398
Average recorded investment with specific allowance recorded	322,148
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Recorded investment	322,148	242,887	322,148
Unpaid principal balance	322,148	336,661	415,922
Average recorded investment	322,148	244,824
Interest income recognized
Interest income recognized for cash payments received
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	4,349,267	191,366	4,353,819
Unpaid principal balance with specific allowance recorded	4,349,267	203,366	4,353,817
Related allowance	823,061	82,296	577,611
Average recorded investment with specific allowance recorded	4,351,542	192,585
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Recorded investment	4,349,267	191,366	4,353,819
Unpaid principal balance	4,349,267	203,366	4,353,817
Average recorded investment	4,351,542	192,585
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	1,174,260	1,512,198	1,196,549
Unpaid principal balance with no specific allowance recorded	1,174,260	1,512,198	1,196,549
Average recorded investment with no specific allowance recorded	1,183,813	1,545,334
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	78,386		239,600
Unpaid principal balance with specific allowance recorded	78,386		239,600
Related allowance	7,986		58,910
Average recorded investment with specific allowance recorded	39,193
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Recorded investment	1,252,646	1,512,198	1,436,149
Unpaid principal balance	1,252,646	1,512,198	1,436,149
Average recorded investment	1,223,006	1,545,334
Interest income recognized
Interest income recognized for cash payments received
Finance Leases Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,593,104	1,314,779	1,690,121
Unpaid principal balance with no specific allowance recorded	1,593,104	1,314,779	1,690,121
Average recorded investment with no specific allowance recorded	1,868,355	1,176,588
Interest income recognized with no specific allowance recorded	18,895	11,603
Interest income recognized for cash payments received with no specific allowance recorded	18,895	11,603
Recorded investment with specific allowance recorded	1,488,964	938,267	1,566,141
Unpaid principal balance with specific allowance recorded	1,488,964	938,267	1,566,143
Related allowance	795,840	483,193	848,919
Average recorded investment with specific allowance recorded	1,300,811	800,606
Interest income recognized with specific allowance recorded
Interest income recognized for cash payments received with specific allowance recorded
Recorded investment	3,082,068	2,253,046	3,256,262
Unpaid principal balance	3,082,068	2,253,046	3,256,264
Average recorded investment	3,169,166	1,977,194
Interest income recognized	18,895	11,603
Interest income recognized for cash payments received	18,895	11,603
Residential Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,147,434	585,186	853,294
Unpaid principal balance with no specific allowance recorded	1,222,215	624,387	892,495
Average recorded investment with no specific allowance recorded	1,025,656	585,981
Interest income recognized with no specific allowance recorded	1,161	1,038
Interest income recognized for cash payments received with no specific allowance recorded	1,161	1,038
Recorded investment with specific allowance recorded	633,340	911,050	807,886
Unpaid principal balance with specific allowance recorded	633,340	946,628	882,018
Related allowance	274,566	199,498	289,112
Average recorded investment with specific allowance recorded	636,134	871,531
Interest income recognized with specific allowance recorded	4,240	1,958
Interest income recognized for cash payments received with specific allowance recorded	4,240	1,958
Recorded investment	1,780,774	1,496,236	1,661,180
Unpaid principal balance	1,855,555	1,571,015	1,774,513
Average recorded investment	1,661,790	1,457,512
Interest income recognized	5,401	2,996
Interest income recognized for cash payments received	5,401	2,996
Consumer Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	175,957	47,480	55,734
Unpaid principal balance with no specific allowance recorded	175,957	47,480	55,734
Average recorded investment with no specific allowance recorded	115,846	212,392
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	48,770	402,120	50,356
Unpaid principal balance with specific allowance recorded	48,770	402,120	50,356
Related allowance	37,932	246,413	39,481
Average recorded investment with specific allowance recorded	49,563	306,279
Interest income recognized with specific allowance recorded	112	1,500
Interest income recognized for cash payments received with specific allowance recorded	112	1,500
Recorded investment	224,727	449,600	106,090
Unpaid principal balance	224,727	449,600	$ 106,090
Average recorded investment	165,409	518,671
Interest income recognized	112	1,500
Interest income recognized for cash payments received	$ 112	$ 1,500