Note 16 - Regulatory Capital Requirements and Restrictions on Dividends (Details Textual) - USD ($)		3 Months Ended	12 Months Ended
	May 13, 2015	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 27, 2016
Annual Phase in Percentage Of Capital Conservation Buffer			0.625%
Capital Required for Capital Adequacy to Risk Weighted Assets with Capital Conservation Buffer Fully Phased in			10.50%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets with Capital Conservation Buffer Fully Phased in			8.50%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets with Capital Conservation Buffer Fully Phased in			7.00%
Stock Issued During Period, Shares, New Issues		1,215,000
Proceeds from Issuance of Common Stock		$ 29,800,000	$ 2,105,774	$ 1,552,673	$ 620,641
Shelf Registration Maximum Value of Equity Authorized For Issuance						$ 100,000,000
Proceeds From Issuance of Common Stock Gross		$ 30,100,000
Common Stock Offering 1 [Member]
Stock Issued During Period, Shares, New Issues	3,680,000			3,680,000
Share Price	$ 18.25
Proceeds from Issuance of Common Stock	$ 63,500,000			$ 63,484,123