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Note 10 - Deposits (Details) - Deposits and Weighted Average Interest Rates (Parentheticals)
Dec. 31, 2014
Range 1 [Member] | Minimum [Member]  
Note 10 - Deposits (Details) - Deposits and Weighted Average Interest Rates (Parentheticals) [Line Items]  
Certificate Interest Rate 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hmnf_Range1Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Range 1 [Member] | Maximum [Member]  
Note 10 - Deposits (Details) - Deposits and Weighted Average Interest Rates (Parentheticals) [Line Items]  
Certificate Interest Rate 0.99%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hmnf_Range1Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Range 2 [Member] | Minimum [Member]  
Note 10 - Deposits (Details) - Deposits and Weighted Average Interest Rates (Parentheticals) [Line Items]  
Certificate Interest Rate 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hmnf_Range2Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Range 2 [Member] | Maximum [Member]  
Note 10 - Deposits (Details) - Deposits and Weighted Average Interest Rates (Parentheticals) [Line Items]  
Certificate Interest Rate 1.99%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hmnf_Range2Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Range 3 [Member] | Minimum [Member]  
Note 10 - Deposits (Details) - Deposits and Weighted Average Interest Rates (Parentheticals) [Line Items]  
Certificate Interest Rate 2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hmnf_Range3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Range 3 [Member] | Maximum [Member]  
Note 10 - Deposits (Details) - Deposits and Weighted Average Interest Rates (Parentheticals) [Line Items]  
Certificate Interest Rate 2.99%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hmnf_Range3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Range 4[Member] | Minimum [Member]  
Note 10 - Deposits (Details) - Deposits and Weighted Average Interest Rates (Parentheticals) [Line Items]  
Certificate Interest Rate 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hmnf_Range4Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Range 4[Member] | Maximum [Member]  
Note 10 - Deposits (Details) - Deposits and Weighted Average Interest Rates (Parentheticals) [Line Items]  
Certificate Interest Rate 3.99%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hmnf_Range4Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember