XML 14 R39.htm IDEA: XBRL DOCUMENT
v2.4.0.8

FINANCIAL INSTRUMENTS AND OTHER FAIR VALUE DISCLOSURES (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2013
FINANCIAL INSTRUMENTS AND OTHER FAIR VALUE DISCLOSURES [Abstract] |
Carrying value of estimated fair value of financial instruments | The carrying value and estimated fair value of the Company`s financial instruments at December 31, 2013 and 2012 are as follows:
All figures in USD '000 |  | Fair Value Hierarchy Level |  |  | 2013 Fair Value |  |  | 2013 Carrying Value |  |  | 2012 Fair Value |  |  | 2012 Carrying Value |
Cash and Cash Equivalents |  |  | 1 |  |  |  | 65,675 |  |  |  | 65,675 |  |  |  | 55,511 |  |  |  | 55,511 |
Marketable Securities |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | 549 |  |  |  | 549 |
Warrants in NAO |  |  | 3 |  |  |  | 915 |  |  |  | 915 |  |  |  | - |  |  |  | - |
Working capital, Related Party |  |  |  |  |  |  | - |  |  |  | - |  |  |  | 36,987 |  |  |  | 36,987 |
Credit Facility |  |  |  |  |  |  | (250,000 | ) |  |  | (250,000 | ) |  |  | (250,000 | ) |  |  | (250,000 | )

X
- Details
Name: | nat_FinancialInstrumentsAbstract
Namespace Prefix: | nat_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
Name: | us-gaap_FairValueByBalanceSheetGroupingTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration