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VESSELS (Details) $ in Thousands	Jun. 30, 2024 USD ($) Vessel	Dec. 31, 2023 USD ($) Vessel
VESSELS [Abstract]
Number of vessels | Vessel	20	20
Vessels and Drydocking Cost	$ 1,232,383	$ 1,232,121
Less Accumulated Depreciation and Impairment Loss on Vessels	(491,581)	(463,537)
Net Book Value Vessels	$ 740,802	$ 768,584

X

- Definition

The accumulated depreciation and impairment amount recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

No definition available.

+ Details

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

X

- Definition

Amount before accumulated depreciation of vessels used in the normal conduct of business and not intended for resale.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount at the balance sheet date of vessels used in the normal conduct of business and not intended for resale, net of accumulated depreciation on vessels.

+ References

No definition available.

+ Details

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

X

- Definition

The number of vessels under the operational management at of the balance sheet date.

+ References

No definition available.

+ Details

Name:	nat_VesselsUnderOperations
Namespace Prefix:	nat_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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