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Note 9 - Investment in Unaffilated Enity (Details) (USD $)
Dec. 31, 2006
Dec. 31, 2012
Note 9 - Investment in Unaffilated Enity (Details) [Line Items]    
Equity Method Investments $ 162,000us-gaap_EquityMethodInvestments  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 4.90%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners  
Reserve Against Value of Investment [Member]    
Note 9 - Investment in Unaffilated Enity (Details) [Line Items]    
Valuation Allowances and Reserves, Balance   $ 162,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= nhld_ReserveAgainstValueOfInvestmentMember