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Note 12 - Acquisition (Details Textual) - USD ($)
9 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 30, 2014
Twin Oaks [Member]              
Stock Issued During Period, Shares, New Issues 776,144            
Business Acquisition, Share Price $ 9.18            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 7,125,000            
Ottawa Savings Bancorp MHC [Member]              
Noncontrolling Interest, Ownership Percentage by Parent 69.10%           57.80%
Twin Oaks [Member] | Loans Receivable [Member] | Estimate of Fair Value Measurement [Member]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets $ 29,795,910            
Twin Oaks [Member] | Loans Receivable [Member]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets 31,831,910            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 407,000            
Certain Loans Acquired in Transfer, Accretable Yield 573,000            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 166,000            
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition 3,194,000            
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition 1,324,000            
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net 1,870,000            
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield 362,000            
Certain Loans Acquired in Transfer, Nonaccretable Difference 1,508,000            
Twin Oaks [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]              
Business Combination, Acquired Receivables, Gross Contractual Amount     $ 1,116,000   $ 1,208,000    
Twin Oaks [Member]              
Business Combination, Acquisition Related Costs   $ 850,000          
Goodwill, Acquired During Period 649,869            
Business Combination, Acquired Receivables, Gross Contractual Amount 28,638,000            
Business Combination, Acquired Receivables, Fair Value 28,472,000            
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield $ 362,000 $ 213,157 $ 101,238 $ 124,583 $ 175,342 $ 302,375