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Note 10 - Deposits (Details) - Certificate Maturities (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 10 - Deposits (Details) - Certificate Maturities [Line Items]    
Interest bearing domestic deposit certificates $ 97,654us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits $ 129,520us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
Weighted average rate domestic deposit certificates of deposit 0.61%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit 0.80%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit
One to Six Months [Member]    
Note 10 - Deposits (Details) - Certificate Maturities [Line Items]    
Interest bearing domestic deposit certificates 32,925us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
/ us-gaap_CreationDateAxis
= hmnf_OneToSixMonthsMember		 43,618us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
/ us-gaap_CreationDateAxis
= hmnf_OneToSixMonthsMember
Weighted average rate domestic deposit certificates of deposit 0.52%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit
/ us-gaap_CreationDateAxis
= hmnf_OneToSixMonthsMember		 0.84%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit
/ us-gaap_CreationDateAxis
= hmnf_OneToSixMonthsMember
Seven to Twelve Months [Member]    
Note 10 - Deposits (Details) - Certificate Maturities [Line Items]    
Interest bearing domestic deposit certificates 26,764us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
/ us-gaap_CreationDateAxis
= hmnf_SevenToTwelveMonthsMember		 43,462us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
/ us-gaap_CreationDateAxis
= hmnf_SevenToTwelveMonthsMember
Weighted average rate domestic deposit certificates of deposit 0.49%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit
/ us-gaap_CreationDateAxis
= hmnf_SevenToTwelveMonthsMember		 0.64%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit
/ us-gaap_CreationDateAxis
= hmnf_SevenToTwelveMonthsMember
Thirteen to Thirty Six Months [Member]    
Note 10 - Deposits (Details) - Certificate Maturities [Line Items]    
Interest bearing domestic deposit certificates 29,929us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
/ us-gaap_CreationDateAxis
= hmnf_ThirteenToThirtySixMonthsMember		 35,542us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
/ us-gaap_CreationDateAxis
= hmnf_ThirteenToThirtySixMonthsMember
Weighted average rate domestic deposit certificates of deposit 0.68%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit
/ us-gaap_CreationDateAxis
= hmnf_ThirteenToThirtySixMonthsMember		 0.86%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit
/ us-gaap_CreationDateAxis
= hmnf_ThirteenToThirtySixMonthsMember
Over 36 Months [Member]    
Note 10 - Deposits (Details) - Certificate Maturities [Line Items]    
Interest bearing domestic deposit certificates $ 8,036us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
/ us-gaap_CreationDateAxis
= hmnf_Over36MonthsMember		 $ 6,898us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
/ us-gaap_CreationDateAxis
= hmnf_Over36MonthsMember
Weighted average rate domestic deposit certificates of deposit 1.03%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit
/ us-gaap_CreationDateAxis
= hmnf_Over36MonthsMember		 1.14%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit
/ us-gaap_CreationDateAxis
= hmnf_Over36MonthsMember