The amount of cash outflow related to the excess cash flow mechanism.

No definition available.

Name:	nat_AdditionalPaymentRelatedToToTheExcessCashFlowMechanism
Namespace Prefix:	nat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The agreement contains covenants that requires a minimum value in unrestricted cash.

+ References

No definition available.

+ Details

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Namespace Prefix:	nat_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage contains covenants that requires a maximum in loan-to-vessel value ratio.

+ References

No definition available.

+ Details

Name:	nat_DebtCovenantsPercentageInLoanToVesselRatio
Namespace Prefix:	nat_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the margin rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	nat_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to amount of minimum liquidity value of debt instrument under credit agreement.

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No definition available.

+ Details

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

- Definition

Refers to the minimum value of adjusted equity under the financing agreement.

+ References

No definition available.

+ Details

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

- Definition

The agreement contains a discretionary excess cash mechanism for the lender that equals to the net earnings from the collateral vessels, less capex provision and amortization.

+ References

No definition available.

+ Details

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Namespace Prefix:	nat_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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- Definition

Refers to the first flexibility period to purchase the vessels as per agreement in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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- Definition

Represents the loan is amortizing with a maturity profile, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Namespace Prefix:	nat_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the minimum value of adjusted equity ratio under the financing agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	nat_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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- Definition

Number of lenders financing the active fleet of Suezmax tankers.

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No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Refers to be number of new buildings.

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No definition available.

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Namespace Prefix:	nat_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Refers to number of vessels delivered to the company during the period.

+ References

No definition available.

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Namespace Prefix:	nat_
Data Type:	xbrli:integerItemType
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- Definition

Number of vessels pledged as collateral for security.

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No definition available.

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Data Type:	xbrli:integerItemType
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Refers to number of vessels used as loan collateral.

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No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Obligations to purchase the vessels for a consideration value each upon the completion of the period of bareboat charter agreements.

+ References

No definition available.

+ Details

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- Definition

Refers to the percentage of loan-to-value ratio.

+ References

No definition available.

+ Details

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- Definition

Refers to the percentage of purchase price expected to pay by lending provider under the terms of the financing agreement.

+ References

No definition available.

+ Details

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- Definition

Refers to the second flexibility period to purchase the vessels as per agreement in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Term of bareboat charter agreement the Company will enter into with the Lessor, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Balance Type:	credit
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- Definition

Amount of contractual obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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No definition available.

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Amount of contractual obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Balance Type:	credit
Period Type:	instant

- References

No definition available.

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Data Type:	xbrli:stringItemType
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- Definition

Date the credit facility terminates, in YYYY-MM-DD format.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-SubTopic 10
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-Subparagraph (SX 210.5-02.19(b),22(b))
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

+ References

+ Details

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Subparagraph (SX 210.6-03(i)(2))
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Balance Type:	credit
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LONG-TERM DEBT AND CURRENT PORTION OF LONG-TERM DEBT (Details) $ in Thousands			1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Feb. 12, 2019 USD ($)	Dec. 01, 2017 USD ($)	Feb. 28, 2023 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) Lender Vessel	Dec. 31, 2022 USD ($) Vessel Building	Dec. 31, 2020 USD ($) Building	Dec. 31, 2018 Vessel	Apr. 29, 2024 USD ($)	Dec. 31, 2021 USD ($)	Dec. 16, 2020 USD ($)
Line of Credit Facility [Abstract]
Number of lenders \| Lender						2
Current portion of long-term debt					$ 31,898	$ 31,898	$ 39,700
Number of new buildings \| Building							2
Contractual Obligation [Abstract]
2024					32,748	32,748
2025					93,611	93,611
2026					21,474	21,474
2027					21,934	21,934
2028					56,690	56,690
More than 5 years					75,313	75,313
Total					304,770	304,770
Cash balance					31,078	$ 31,078	$ 59,583				$ 34,739
2019 Senior Secured Credit Facility [Member]
Line of Credit Facility [Abstract]
Number of vessels used as collateral \| Vessel						20
Debt instrument term						5 years
Maximum borrowing capacity	$ 306,100				30,000	$ 30,000
Loan amortizing, maturity period						20 years
Maturity date						Feb. 28, 2025
Discretionary excess cash mechanism for the lender that equals to net earnings from collateral vessels	50.00%
Deferred financing costs					400	$ 400	1,500
Debt covenants, minimum liquidity	$ 20,000					20,000	30,000
Debt covenants percentage in loan-to-vessel ratio	70.00%
Drawn amount					84,600	84,600	129,200
Current portion of long-term debt					$ 11,700	11,700	25,800
Repayment of debt						$ 44,600
Additional payment related to excess cash flow mechanism			$ 15,200
Contractual Obligation [Abstract]
Number of vessels used as loan collateral \| Vessel						14
2019 Senior Secured Credit Facility [Member] \| Forecast [Member]
Line of Credit Facility [Abstract]
Drawn amount										$ 81,600
2019 Senior Secured Credit Facility [Member] \| Subsequent Event [Member]
Line of Credit Facility [Abstract]
Repayment of debt				$ 3,000
2019 Senior Secured Credit Facility [Member] \| Maximum [Member]
Contractual Obligation [Abstract]
Percentage of loan-to-value ratio					15.00%	15.00%
$30 Million Accordion Loan [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity												$ 30,000
Maturity date						Feb. 28, 2025
Financing of 2018-built Vessels [Member]
Line of Credit Facility [Abstract]
Number of vessels delivered \| Vessel									3
Deferred financing costs		$ 2,300
Drawn amount					$ 87,200	$ 87,200	96,000
Percentage of purchase price expected to pay by lending provider		77.50%
Term of bareboat charter agreement						10 years
Obligation to purchase the vessels		$ 13,600
First flexibility period to purchase the vessels						60 months
Second flexibility period to purchase the vessels						84 months
Minimum value adjusted equity		$ 175,000
Minimum value adjusted equity ratio		25.00%
Minimum liquidity value		$ 20,000
Long term debt current					8,900	$ 8,900	$ 8,500
Contractual Obligation [Abstract]
2024					9,138	9,138
2025					9,534	9,534
2026					9,974	9,974
2027					10,434	10,434
2028					48,159	48,159
More than 5 years					0	0
Total					$ 87,239	$ 87,239
Financing of 2018-built Vessels [Member] \| SOFR [Member]
Line of Credit Facility [Abstract]
Basis spread on margin						4.52%
Basis spread on variable rate					0.26%	0.25%
2019 Senior Secured Credit Facility including $30 mill Accordion Loan [Member]
Line of Credit Facility [Abstract]
Number of vessels used as collateral \| Vessel						14
Contractual Obligation [Abstract]
2024					$ 12,079	$ 12,079
2025					72,561	72,561
2026					0	0
2027					0	0
2028					0	0
More than 5 years					0	0
Total					84,640	84,640
Financing of 2022-built Vessels [Member]
Line of Credit Facility [Abstract]
Number of vessels delivered \| Vessel							2
Deferred financing costs					5,400	5,400	$ 5,400
Drawn amount					79,400	$ 79,400	$ 84,900
Percentage of purchase price expected to pay by lending provider							80.00%
Term of bareboat charter agreement						10 years
Obligation to purchase the vessels								$ 16,500
First flexibility period to purchase the vessels						60 months
Second flexibility period to purchase the vessels						84 months
Minimum liquidity value					20,000	$ 20,000
Number of new buildings \| Building								2
Contractual Obligation [Abstract]
2024					5,515	5,515
2025					5,500	5,500
2026					5,500	5,500
2027					5,500	5,500
2028					5,515	5,515
More than 5 years					51,521	51,521
Total					$ 79,351	$ 79,351
Financing of 2022-built Vessels [Member] \| SOFR [Member]
Line of Credit Facility [Abstract]
Basis spread on margin						4.50%
Basis spread on variable rate					0.26%	0.26%
Financing of Nordic Hawk [Member]
Line of Credit Facility [Abstract]
Drawn amount					$ 53,500	$ 53,500	$ 0
Percentage of purchase price expected to pay by lending provider						75.00%
Term of bareboat charter agreement						8 years
Obligation to purchase the vessels						$ 5,900
First flexibility period to purchase the vessels						60 months
Second flexibility period to purchase the vessels						84 months
Minimum liquidity value					20,000	$ 20,000
Long term debt current					5,900	5,900	$ 0
Contractual Obligation [Abstract]
2024					6,016	6,016
2025					6,016	6,016
2026					6,000	6,000
2027					6,000	6,000
2028					6,016	6,016
More than 5 years					23,492	23,492
Total					$ 53,540	$ 53,540
Financing of Nordic Hawk [Member] \| SOFR [Member]
Line of Credit Facility [Abstract]
Basis spread on margin						4.76%