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Note 10 - Deposits (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Note 10 - Deposits (Details) [Line Items]    
Time Deposits, $100,000 or More $ 166,900,000us-gaap_TimeDeposits100000OrMore $ 200,800,000us-gaap_TimeDeposits100000OrMore
Certificates of Deposit, at Carrying Value 0.0us-gaap_CertificatesOfDepositAtCarryingValue 7,600,000us-gaap_CertificatesOfDepositAtCarryingValue
Available-for-sale Securities Pledged as Collateral 19,400,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral 18,900,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Federal Home Loan Bank [Member]    
Note 10 - Deposits (Details) [Line Items]    
Loans Pledged as Collateral $ 1,000,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= hmnf_FederalHomeLoanBankMember
$ 1,000,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= hmnf_FederalHomeLoanBankMember