Annual report pursuant to section 13 and 15(d)

INVESTMENT IN AL MASANE AL KOBRA MINING COMPANY (AMAK) (Details)

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INVESTMENT IN AL MASANE AL KOBRA MINING COMPANY (AMAK) (Details) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Aug. 31, 2011
AMAK [Member]
Jul. 31, 2011
AMAK [Member]
Aug. 31, 2009
AMAK [Member]
Dec. 31, 2011
AMAK [Member]
Apr. 30, 2009
AMAK [Member]
Dec. 31, 2012
AMAK [Member]
Dec. 31, 2011
AMAK [Member]
Dec. 31, 2010
AMAK [Member]
Dec. 31, 2009
AMAK [Member]
Dec. 31, 2008
AMAK [Member]
Jun. 30, 2011
AMAK [Member]
May 31, 2011
AMAK [Member]
Jul. 31, 2011
AMAK [Member]
Saudi Investors [Member]
Dec. 31, 2012
AMAK [Member]
Saudi Investors [Member]
Dec. 31, 2011
AMAK [Member]
Saudi Investors [Member]
Dec. 31, 2008
AMAK [Member]
Saudi Investors [Member]
Dec. 31, 2007
AMAK [Member]
Saudi Investors [Member]
Jul. 31, 2011
AMAK [Member]
ARMICO [Member]
Investment in Al Masane Al Kobra Mining Company Amak [Line Items]                                          
Number of other investors in AMAK                                     7 7  
Cost incurred in formation of AMAK                         $ 3,750,000                
Percentage investment in Al Masane AL Kobra (in hundredths)                         50.00%                
Cash contributed by other investors to AMAK                                 60,000,000       37,300,000
Percentage interest acquire by other investors in AMAK (in hundredths)                               53.00%     50.00%   10.00%
Number of board members can be appointed by entity         4       4                        
Maximum number of board members as per by laws         9         8                      
Number of board members other investors entitled to appoint                                   4      
Investment in AMAK [Abstract]                                          
Accumulated costs of mineral Interests in Saudi Arabia                 40,290,000                        
Contribution of AMAK organization costs                 3,712,000                        
Loan payable assumed by AMAK                 11,000,000                        
Net initial investment in AMAK                 33,002,000                        
Equity method investment, minimum ownership percentage (in hundredths)                 20.00%                        
Contingent cash contribution to AMAK               30,000,000                          
Gain upon formation of AMAK                 16,200,000                        
Fair value of investment upon formation of the equity method investee                 120,000,000                        
Percentage investment in AMAK (in hundredths) 37.00%       37.00% 41.00%                              
Number of shares related to subscription price of fully paid interest (in shares)           18,450,000                              
Percentage of interest conveyed in joint venture (in hundredths)           9.00%                              
Number of shares conveyed in joint venture (in shares)           4,050,000                              
Number of shares that can be repurchased (in shares)           4,050,000                              
Percentage deduction from fair market value (in hundredths)           10.00%                              
Number of shares acquired in joint venture by other investors (in shares)                                         5,000,000
Impairment charges on investment in AMAK                   0 0 0                  
Results of Operations [Abstract]                                          
Sales                 37,407,000 0 0                    
Gross Profit                 6,846,000 0 0                    
General, administrative and other expenses                 6,325,000 2,613,000 2,130,000                    
Net Income (loss)                 521,000 (2,613,000) (2,130,000)                    
Financial Position [Abstract]                                          
Current assets             98,365,000   92,529,000 98,365,000                      
Noncurrent assets             237,167,000   252,283,000 237,167,000                      
Total assets             335,532,000   344,812,000 335,532,000                      
Current liabilities             61,636,000   81,568,000 61,636,000                      
Long term liabilities             54,223,000   46,979,000 54,223,000                      
Shareholders' equity             219,673,000   216,265,000 219,673,000                      
Total liabilities and Shareholders' equity             335,532,000   344,812,000 335,532,000                      
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]                                          
Company's share of income (loss) reported by AMAK                 192,000 (1,018,000) (874,000)                    
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK                 674,000 0 0                    
Equity in income (loss) of AMAK 866,000 (1,018,000) [1] (874,000) [1]           866,000 (1,018,000) (874,000)                    
Increase in the entity's share in net assets of AMAK                   8,900,000                      
Advances to AMAK 2,162,000 120,000 [1]         120,000   2,162,000 120,000       750,000 50,000            
Proceeds from advances to AMAK       750,000     70,000                            
Additional advances to AMAK                 $ 2,041,000                        
[1] Restated - See Note 2