Note 3 - Troubled Debt Restructurings (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2016 USD ($)	Jun. 30, 2015	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Extended Maturity [Member] | Commercial Portfolio Segment [Member]
Number of Loans / Leases			1	1
Pre-Modification Recorded Investment			$ 52,286	$ 52,286
Post-Modification Recorded Investment			$ 52,286	$ 52,286
Extended Maturity [Member] | Finance Leases Portfolio Segment [Member]
Number of Loans / Leases				4
Pre-Modification Recorded Investment				$ 410,653
Post-Modification Recorded Investment				$ 410,653
Extended Maturity [Member]
Number of Loans / Leases			1	5
Pre-Modification Recorded Investment			$ 52,286	$ 462,939
Post-Modification Recorded Investment			$ 52,286	$ 462,939
Payment Deferral [Member] | Commercial Portfolio Segment [Member]
Number of Loans / Leases			1	1
Pre-Modification Recorded Investment			$ 62,140	$ 62,140
Post-Modification Recorded Investment			$ 62,140	$ 62,140
Payment Deferral [Member] | Finance Leases Portfolio Segment [Member]
Number of Loans / Leases			4	5
Pre-Modification Recorded Investment			$ 494,692	$ 540,631
Post-Modification Recorded Investment			$ 494,692	$ 540,631
Payment Deferral [Member]
Number of Loans / Leases			5	6
Pre-Modification Recorded Investment			$ 556,832	$ 602,771
Post-Modification Recorded Investment			$ 556,832	$ 602,771
Interest Rate Below Market Reduction [Member] | Commercial Real Estate Portfolio Segment [Member]
Number of Loans / Leases			1	1
Pre-Modification Recorded Investment			$ 1,233,740	$ 1,233,740
Post-Modification Recorded Investment			$ 1,233,740	$ 1,233,740
Interest Rate Below Market Reduction [Member]
Number of Loans / Leases			1	1
Pre-Modification Recorded Investment			$ 1,233,740	$ 1,233,740
Post-Modification Recorded Investment			$ 1,233,740	$ 1,233,740
Number of Loans / Leases		0	7	12
Pre-Modification Recorded Investment	$ 2,299,450		$ 1,842,858
Post-Modification Recorded Investment	$ 2,299,450		$ 1,842,858