Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK (Details)

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INVESTMENT IN AMAK (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]          
Company's share of loss reported by AMAK $ (706) $ (331) $ (984) $ (1,018)  
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK 337 337 674 674  
Equity in income (loss) of AMAK (369) 6 (310) (344)  
AMAK [Member]          
Investment in Al Masane Al Kobra Mining Company Amak [Line Items]          
Investment in AMAK $ 52,700   $ 52,700   $ 53,000
AMAK [Member]          
Schedule of Equity Method Investments [Line Items]          
Percentage investment in AMAK (in hundredths) 35.00%   35.00%   35.00%
Results of Operations [Abstract]          
Sales $ 13,283 30,431 $ 18,584 30,698  
Gross Profit 1,034 4,045 2,746 4,684  
General, administrative and other expenses 3,036 4,982 5,538 7,570  
Net Loss (2,002) (937) (2,792) (2,886)  
Depreciation, depletion and amortization 5,905 4,157 11,015 10,814  
Net income before depreciation and amortization 3,903 $ 3,220 8,223 $ 7,928  
Financial Position [Abstract]          
Current assets 40,478   40,478   $ 17,782
Noncurrent assets 262,920   262,920   265,584
Total assets 303,398   303,398   283,366
Current liabilities 24,336   24,336   23,034
Long term liabilities 89,120   89,120   67,598
Shareholders' equity 189,942   189,942   192,734
Total liabilities and Shareholders' equity $ 303,398   $ 303,398   $ 283,366