Note 1 - Nature of Business (Details Textual)	Oct. 11, 2016 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jul. 11, 2005 $ / shares
Subsequent Event [Member] | Bank [Member]
Stock Issued During Period, Shares, Employee Stock Ownership Plan | shares	190,716
Subsequent Event [Member] | Ottawa Savings Bancorp, Inc. Merger [Member]
Business Combination, Ratio for Conversion of Acquiree's Outstanding Common Shares into Acquirer's Common Shares	1.1921
Subsequent Event [Member]
Proceeds from Issuance of Common Stock | $	$ 23,800,000
Stock Issued During Period, Shares, New Issues | shares	2,383,950
Share Price | $ / shares	$ 10
Share Price | $ / shares				$ 10
Assets | $		$ 276,086,816	$ 213,563,351