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Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Troubled Debt Restructurings that Subsequently Defaulted (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Troubled Debt Restructurings that Subsequently Defaulted [Line Items]    
Number of contracts 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Outstanding recorded investment $ 640us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 $ 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
1-4 Family [Member]    
Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Troubled Debt Restructurings that Subsequently Defaulted [Line Items]    
Number of contracts 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hmnf_Family14Member		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hmnf_Family14Member
Outstanding recorded investment $ 640us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hmnf_Family14Member		 $ 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hmnf_Family14Member