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INVESTMENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 2 Months Ended 12 Months Ended
Nov. 12, 2015
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Nov. 30, 2015
May. 30, 2015
Business Acquisition [Line Items]                
Private equity placement issued amount         $ 113,433 $ 172,611    
Warrants received (in shares)     833,333     833,333    
Warrants exercise price (n dollars per share)     $ 15.00     $ 15.00    
Percentage of warrants vesting increments           20.00%    
Percentages of increase in volume weighted average price           10.00%    
Minimum business days required for exercise level of VWAP           10 days    
VWAP minimum trading volume of exercise levels     $ 2,000     $ 2,000    
Shares as dividend-in-kind (in shares)         699,802      
Gain on investment       $ (2,462)   40    
Company acquired additional shares in open market (in shares)         488,216      
NATs share of NAOs total market capitalization       31,700 $ 55,200      
Financial Position [Abstract]                
Noncurrent assets       64,877        
Summarized Statement of Operations information [Abstract]                
NATs portion of NAOs Net (Loss) Income       $ 0   $ 0    
Adjusted [Member]                
Business Acquisition [Line Items]                
Gain on investment         1,559      
Financial Position [Abstract]                
Noncurrent assets         62,059      
Summarized Statement of Operations information [Abstract]                
NATs portion of NAOs Net (Loss) Income         $ 1,929      
Nordic American Offshore Repurchase Program [Member]                
Business Acquisition [Line Items]                
Repurchase Program, shares authorized to be repurchased (in shares)               2,500,000
Shares repurchased during the period (in shares)       870,839        
Remaining shares available to be repurchased (in shares)       22,560,531        
Nordic American Offshore Limited [Member]                
Business Acquisition [Line Items]                
Gain on investment       $ 2,100        
Company acquired additional shares in private transaction (in shares) 1,521,300              
Ownership interest       26.70% 19.20%   26.50%  
Financial Position [Abstract]                
Current assets       $ 14,565 $ 51,743      
Noncurrent assets       322,802 270,678      
Total Assets       337,367 322,421      
Current liabilities       7,735 3,191      
Noncurrent liabilities       48,775 0      
Total Shareholders' Equity       280,857 319,230      
Total liabilities and equity       337,367 322,421      
NATs share of NAOs equity       75,000 61,300      
Summarized Statement of Operations information [Abstract]                
Operating Revenues     1,280 36,372 52,789      
Net Operating (Loss) Income     (258) (8,372) 11,262      
Net (Loss) Income     $ (70) (10,844) 6,931      
NATs portion of NAOs Net (Loss) Income       (2,500) $ 1,600      
Nordic American Offshore Limited [Member] | Minimum [Member]                
Business Acquisition [Line Items]                
Percentage of warrants vesting increments           25.00%    
Nordic American Offshore Limited [Member] | Maximum [Member]                
Business Acquisition [Line Items]                
Percentage of warrants vesting increments           65.00%    
Nordic American Offshore Limited [Member] | Private Placement [Member]                
Business Acquisition [Line Items]                
Private equity placement issued amount       250,000        
Private equity placement participation       $ 65,000        
Private equity placement participation (in shares)       4,333,566        
Nordic American Offshore Limited [Member] | IPO [Member]                
Business Acquisition [Line Items]                
Shares acquired (in shares)   375,000            
Cost of shares acquired   $ 5,600