Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK (Details)

v3.7.0.1
INVESTMENT IN AMAK (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Jul. 31, 2016
$ / shares
shares
Mar. 31, 2017
USD ($)
SAR / $
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jul. 31, 2016
SAR / shares
shares
Jun. 30, 2016
Results of Operations [Abstract]            
Loss from operations   $ 4,192 $ 6,145      
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]            
Equity in earnings (loss) of AMAK   $ (966) 5,367      
AMAK [Member]            
Schedule of Equity Method Investments [Line Items]            
Shares issued (in shares) | shares 4,000,000          
Percentage investment in AMAK 33.44% 33.44%   33.44% 33.44% 35.25%
Investment in AMAK   $ 48,200   $ 49,400    
Exchange rate | SAR / $   3.75        
Results of Operations [Abstract]            
Sales   $ 2,256 8,992      
Gross profit (loss)   (1,307) 191      
General, administrative and other expenses   2,589 2,147      
Loss from operations   (3,896) (1,956)      
Gain on settlement with former operator   0 16,225      
Net income (loss)   (3,896) 14,269      
Depreciation and amortization   500 2,700      
Net income (loss) before depreciation and amortization   (3,369) 16,978      
Financial Position [Abstract]            
Current assets   17,333   22,860    
Noncurrent assets   257,715   251,741    
Total assets   275,048   274,601    
Current liabilities   10,326   8,005    
Long term liabilities   84,567   82,546    
Shareholders' equity   180,155   184,050    
Total liabilities and Shareholders' equity   275,048   $ 274,601    
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]            
AMAK Net income (loss)   (3,896) 14,269      
Company's share of income (loss) reported by AMAK   (1,303) 5,030      
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK   337 337      
Equity in earnings (loss) of AMAK   $ (966) $ 5,367      
Arab Mining Co [Member]            
Schedule of Equity Method Investments [Line Items]            
Shares issued (in shares) | shares 3,750,000          
Share price (in dollars per share) | (per share) $ 5.33       SAR 20.00  
Shares reserved for future issuance (in shares) | shares 250,000       250,000