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Note 9 - Property and Equipment (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Note 9 - Property and Equipment (Details) [Line Items]    
Construction in Progress, Gross $ 35,687,000us-gaap_ConstructionInProgressGross $ 21,618,000us-gaap_ConstructionInProgressGross
Obligation to Complete [Member]    
Note 9 - Property and Equipment (Details) [Line Items]    
Construction in Progress, Gross $ 25,541,000us-gaap_ConstructionInProgressGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nhc_ObligationToCompleteMember