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Note 7 - Goodwill and Other Intangible Asset (Details Textual) - USD ($)
3 Months Ended
May 13, 2016
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition, Goodwill, Expected Tax Deductible Amount   $ 2,700,000  
Fairmount Bancorp, Inc. [Member]      
Operating Loss Carryforwards     $ 544,000
Real Estate Loans [Member] | One-to four-family [Member]      
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     $ 451,223
Core Deposits [Member]      
Finite-Lived Intangible Asset, Useful Life 8 years 8 years