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Note 14 - Contingencies and Commitments (Details) (USD $)
3 Months Ended 36 Months Ended 51 Months Ended
Mar. 31, 2015
Dec. 31, 2010
Dec. 31, 2007
Mar. 31, 2015
Dec. 31, 2014
Oct. 22, 2014
May 07, 2015
Jan. 01, 2016
Note 14 - Contingencies and Commitments (Details) [Line Items]                
Self Insurance Reserve $ 110,900,000us-gaap_SelfInsuranceReserve     $ 110,900,000us-gaap_SelfInsuranceReserve $ 106,218,000us-gaap_SelfInsuranceReserve      
Direct Business Coverage Statutory Limits 1,000,000nhc_DirectBusinessCoverageStatutoryLimits              
Malpractice Loss Contingency, Number of Claims 37us-gaap_MalpracticeLossContingencyNumberOfClaims     37us-gaap_MalpracticeLossContingencyNumberOfClaims        
Annual Excess Coverage   9,000,000nhc_AnnualExcessCoverage 7,500,000nhc_AnnualExcessCoverage 4,000,000nhc_AnnualExcessCoverage        
Line of Credit Facility, Maximum Borrowing Capacity           75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity    
Subsequent Event [Member] | National HealthCare [Member] | National [Member] | Line of Credit [Member]                
Note 14 - Contingencies and Commitments (Details) [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity             7,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= nhc_NationalMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhc_NationalHealthCareMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Scenario, Forecast [Member] | National HealthCare [Member] | National [Member] | Line of Credit [Member]                
Note 14 - Contingencies and Commitments (Details) [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity               2,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= nhc_NationalMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhc_NationalHealthCareMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Caris [Member]                
Note 14 - Contingencies and Commitments (Details) [Line Items]                
Equity Method Investment, Ownership Percentage 75.10%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nhc_CarisMember
    75.10%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nhc_CarisMember
       
National HealthCare [Member] | National [Member] | Prime Rate [Member] | Line of Credit [Member]                
Note 14 - Contingencies and Commitments (Details) [Line Items]                
Debt Instrument, Basis Spread on Variable Rate 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= nhc_NationalMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhc_NationalHealthCareMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
             
National HealthCare [Member] | National [Member] | Line of Credit [Member]                
Note 14 - Contingencies and Commitments (Details) [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity 2,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= nhc_NationalMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhc_NationalHealthCareMember
    2,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= nhc_NationalMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhc_NationalHealthCareMember
       
Long-term Line of Credit 0us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= nhc_NationalMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhc_NationalHealthCareMember
    0us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= nhc_NationalMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nhc_NationalHealthCareMember
       
Coverage Amount per Incident [Member]                
Note 14 - Contingencies and Commitments (Details) [Line Items]                
Primary Insurance Coverage Amount Per Incident 1,000,000nhc_PrimaryInsuranceCoverageAmountPerIncident
/ nhc_PrimaryCoverageAxis
= nhc_CoverageAmountPerIncidentMember
             
Coverage Amount per Location [Member]                
Note 14 - Contingencies and Commitments (Details) [Line Items]                
Primary Insurance Coverage Amount Per Location $ 3,000,000nhc_PrimaryInsuranceCoverageAmountPerLocation
/ nhc_PrimaryCoverageAxis
= nhc_CoverageAmountPerLocationMember