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INVESTMENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2017
Jun. 30, 2014
Nov. 18, 2013
Nov. 30, 2015
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jul. 20, 2017
Jun. 16, 2017
Dec. 31, 2007
Business Acquisition [Line Items]                        
Private equity placement issued amount           $ 103,748 $ 120,069          
Shares as dividend-in-kind (in shares)                 699,802      
Company acquired additional shares in open market (in shares)                 488,216      
Company acquired additional shares in private transaction (in shares)       1,521,300                
Dividends paid (in dollars per share)           $ 0.53 $ 1.37 $ 1.38        
Cash value (in dollars per share)                     $ 30 $ 115
Loss on investments           $ (8,435) $ (46,642) $ (2,462)        
Impairment of investment           0 37,300          
NATs share of NAOs total market capitalization           $ 12,000 $ 16,600          
Nordic American Offshore Limited [Member]                        
Business Acquisition [Line Items]                        
Private equity placement participation         $ 10,000              
Shares as dividend-in-kind (in shares) 4,024,745                      
Ownership interest         22.60% 16.10% 29.10%          
Transaction recognized in dilution loss         $ 2,600              
Dividends paid (in dollars per share) $ 0.10                      
Number of shareholders held common shares (in shares) 250                      
Number of shareholders received common shares (in shares) 1                      
Common shares received per common share (in shares) 24.4                      
Cash value (in dollars per share) $ 0.05                      
Closing price (in dollars per share)                   $ 1.22    
Maximum number of shares held by shareholder to receive cash dividend (in shares) 249                      
Cash dividend received per common share (in dollars per share) $ 0.05                      
Loss on investments $ 700                      
Carrying value of investment           $ 12,200            
Financial Position [Abstract]                        
Current assets           37,076 $ 7,909          
Noncurrent assets           350,635 366,945          
Total Assets           387,711 374,854          
Current liabilities           2,809 4,089          
Noncurrent liabilities           136,629 136,568          
Total Shareholders' Equity           248,273 234,196          
Total liabilities and equity           387,711 374,854          
NATs share of NAOs equity           40,000 68,100          
Summarized Statement of Operations information [Abstract]                        
Operating Revenues           17,895 17,697 36,372        
Net Operating (Loss) Income           (26,068) (28,543) (8,372)        
Net (Loss) Income           (29,326) (32,151) (10,844)        
NATs portion of NAOs Net (Loss) Income           (5,100) (9,300) $ (2,500)        
Dividends received           $ 1,000 $ 1,700          
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