Note 3 - Loans Leases Receivable (Details Textual)	3 Months Ended				6 Months Ended
	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)		Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 13,217,409	$ 13,919,066			$ 13,217,409
Financing Receivable, Modifications, Recorded Investment	$ 9,083,036	8,647,007			$ 9,083,036
Financing Receivable, Modifications, Number of Contracts	17			7	28	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 948,170			$ 1,842,858	$ 1,757,983	$ 2,299,450
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down		195,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2			0	2	0
Losses on Residual Value	$ 0			$ 0	$ 0	$ 0
Nonaccrual [Member]
Financing Receivable, Modifications, Number of Contracts					0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment						$ 1,233,740
Troubled Debt Restructurings [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	2,167,863	$ 2,300,479			$ 2,167,863
Financing Receivable, Modifications, Number of Contracts		2
Residential Portfolio Segment [Member]
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage	705,800	$ 1,135,500			705,800
Financing Receivable, Recorded Investment, Nonaccrual Status	1,047,911	1,075,639	[1]		1,047,911
Residential Portfolio Segment [Member] | Troubled Debt Restructurings [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	41,465	43,579			41,465
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	4,074,004	4,187,786	[1]		4,074,004
Commercial Portfolio Segment [Member] | Troubled Debt Restructurings [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	268,629	48,501			268,629
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	4,347,017	4,353,819	[1]		4,347,017
Commercial Real Estate Portfolio Segment [Member] | Troubled Debt Restructurings [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,148,818	1,380,047			1,148,818
Commercial Real Estate Portfolio Segment [Member] | Troubled Debt Restructurings [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	179,881				179,881
Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	2,047,694	2,446,181	[1]		2,047,694
Finance Leases Portfolio Segment [Member] | Troubled Debt Restructurings [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	519,178	816,149			519,178
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	223,708	87,344	[1]		223,708
Consumer Portfolio Segment [Member] | Troubled Debt Restructurings [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 9,892	$ 12,203			$ 9,892

[1] Nonaccrual loans/leases included $2,300,479 of TDRs, including $48,501 in C&I loans, $1,380,047 in CRE loans, $816,149 in direct financing leases, $43,579 in residential real estate loans, and $12,203 in installment loans.