FINANCIAL INSTRUMENTS AND OTHER FAIR VALUE DISCLOSURES (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Accordion loan amount	$ 30,000
Fair Value [Member] \| Level 1 [Member] \| Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents	39,177	$ 31,078
Restricted Cash	5,207	2,283
Fair Value [Member] \| Level 2 [Member] \| Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
2019 Senior Secured Credit Facility including $30 million Accordion Loan	(72,561)	(84,640)
Fair Value [Member] \| Level 2 [Member] \| Recurring [Member] \| Financing of 2018-built Vessels [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Estimated fair value	(78,101)	(87,239)
Fair Value [Member] \| Level 2 [Member] \| Recurring [Member] \| Financing of 2022-built Vessels [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Estimated fair value	(73,836)	(79,351)
Fair Value [Member] \| Level 2 [Member] \| Recurring [Member] \| Financing of Nordic Hawk [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Estimated fair value	(47,524)	(53,540)
Carrying Value [Member] \| Level 1 [Member] \| Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents	39,177	31,078
Restricted Cash	5,207	2,283
Carrying Value [Member] \| Level 2 [Member] \| Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
2019 Senior Secured Credit Facility including $30 million Accordion Loan	(72,494)	(84,155)
Carrying Value [Member] \| Level 2 [Member] \| Recurring [Member] \| Financing of 2018-built Vessels [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Estimated fair value	(77,241)	(86,145)
Carrying Value [Member] \| Level 2 [Member] \| Recurring [Member] \| Financing of 2022-built Vessels [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Estimated fair value	(73,028)	(78,425)
Carrying Value [Member] \| Level 2 [Member] \| Recurring [Member] \| Financing of Nordic Hawk [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Estimated fair value	$ (46,941)	$ (52,871)

Fair value portion of restricted cash.

No definition available.

Name:	nat_RestrictedCashFairValueDisclosure
Namespace Prefix:	nat_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

No definition available.

+ Details

Name:	nat_SeniorSecuredCreditFacilityIncludingAccordionLoanFairValueDisclosure
Namespace Prefix:	nat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_DepositsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

+ Details

Name:	us-gaap_LinesOfCreditFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=nat_BuiltVesselsFinancingTwoZeroOneEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=nat_BuiltVesselsFinancingTwoZeroTwoTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=nat_NordicHawkFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: