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Note 3 - Net Patient Revenues - Contract Liabilities (Details) | 3 Months Ended
--- | ---
Mar. 31, 2024 USD ($)
Balance | $ 0
Payments received | 9,881,000
Payments recouped | (2,214,000)
Balance | $ 7,667,000

X
- Definition Represents the amount of payments recouped under the Government Assistance Medicare Accelerated and Advance Payment Program. + References No definition available. + Details
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Namespace Prefix: | nhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents proceeds received from Government Assistance Medicare Accelerated and Advance Payment Program. + References No definition available. + Details
Name: | nhc_PaymensReceivedGovernmentAssistanceMedicareAcceleratedAndAdvancePaymentProgram
Namespace Prefix: | nhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant