Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK (Details)

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INVESTMENT IN AMAK (Details)
 3 Months Ended
Mar. 31, 2018
USD ($)
ر.س / $
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]      
Equity in earnings (loss) of AMAK $ 230,000 $ (966,000)  
Treasury Stock [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of stock exchanged (in shares) | shares 65,000    
AMAK [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of stock exchanged (in shares) | shares 24,489    
Percentage investment in AMAK 33.41%   33.44%
Investment in AMAK $ 45,200,000   $ 45,100,000
Exchange rate | ر.س / $ 3.75    
Results of Operations [Abstract]      
Sales $ 14,087,000 2,256,000  
Gross profit (loss) 1,581,000 (1,307,000)  
General, administrative and other expenses 1,900,000 2,589,000  
Net Loss (319,000) (3,896,000)  
Depreciation and amortization 7,700,000 500,000  
Net income (loss) before depreciation and amortization 7,382,000 (3,369,000)  
Financial Position [Abstract]      
Current assets 33,273,000   23,333,000
Noncurrent assets 228,733,000   237,875,000
Total assets 262,006,000   261,208,000
Current liabilities 22,873,000   24,439,000
Long term liabilities 71,520,000   68,837,000
Shareholders' equity 167,613,000   167,932,000
Total liabilities and Shareholders' equity 262,006,000   261,208,000
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]      
AMAK Net Loss (319,000) (3,896,000)  
Company's share of loss reported by AMAK (107,000) (1,303,000)  
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK 337,000 337,000  
Equity in earnings (loss) of AMAK 230,000 $ (966,000)  
Amount receivable for unreimbursed travel expenses $ 165,000   $ 121,000