Note 10 - FHLB Advances - Summary of Prepayments of FHLB Advances (Details) - USD ($)	3 Months Ended					12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Amount	$ 15,000,000	$ 5,000,000	$ 10,000,000	$ 3,000,000	$ 75,500,000	$ 30,000,000	$ 78,500,000
Weighted Average Interest Rate	3.14%	2.84%	3.86%	3.98%	4.36%	3.33%	4.35%
Prepayment Fees	$ 357,161	$ 127,310	$ 524,197	$ 209,416	$ 5,692,185	$ 1,008,668	$ 5,901,601