Note 21 - Pending Merger (Details Textual) - USD ($)		12 Months Ended
	Apr. 02, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets		$ 794,459,520	$ 687,979,819
Liabilities		719,568,027	618,005,439
Stockholders' Equity Attributable to Parent		74,891,493	69,974,380	$ 66,422,465	$ 61,476,847
Net Income (Loss) Attributable to Parent		5,157,664	$ 5,594,011	$ 5,716,767
Hometown Bank, N.A. [Member]
Assets		179,600,000
Liabilities		163,200,000
Stockholders' Equity Attributable to Parent		16,400,000
Net Income (Loss) Attributable to Parent		$ 210,000
Scenario, Forecast [Member] | Hometown Merger [Member]
Business Acquisition, Share Price	$ 20
Business Combination, Consideration Transferred	$ 4,600,000