Annual report pursuant to section 13 and 15(d)

INCOME TAXES (Details)

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INCOME TAXES (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Provision for income taxes [Abstract]      
Current federal provision $ 6,748,000 $ 4,821,000 $ 3,072,000
Current state provision 233,000 199,000 191,000
Deferred federal provision 1,173,000 882,000 3,237,000
Deferred state provision (7,000) 2,000 5,000
Income tax expense 8,147,000 5,904,000 6,505,000
Federal statutory rate (in hundredths) 35.00% 35.00% 34.00%
Effective tax rate in income tax expense and the Federal statutory rate [Abstract]      
Income taxes at U.S. statutory rate 9,675,000 5,679,000 6,933,000
State taxes, net of federal benefit 139,000 132,000 127,000
Prior year overpayments 0 0 0
Permanent and other items (644,000) (250,000) (567,000)
Increase (decrease) in valuation allowance (1,023,000) 343,000 12,000
Income tax expense 8,147,000 5,904,000 6,505,000
Current and future Federal effective tax rate (in hundredths) 35.00%    
Deferred tax liabilities [Abstract]      
Plant, pipeline and equipment (8,507,000) (8,260,000)  
Contractual based asset (43,000) (124,000)  
Investment in AMAK (4,757,000) (1,712,000)  
Total deferred tax liabilities (13,307,000) (10,096,000)  
Deferred tax assets [Abstract]      
Accounts receivable 260,000 201,000  
Inventory 131,000 95,000  
Mineral interests 376,000 376,000  
Unrealized loss on interest rate swap 214,000 313,000  
Environmental 71,000 123,000  
Post-retirement benefits 373,000 370,000  
Stock-based compensation 1,015,000 716,000  
Deferred revenue 654,000 332,000  
Gross deferred tax assets 3,094,000 2,526,000  
Valuation allowance (447,000) (1,470,000)  
Total net deferred tax assets 2,647,000 1,056,000  
Net deferred tax liabilities (10,660,000) (9,040,000)  
Current [Abstract]      
Deferred tax asset 1,324,000 1,054,000  
Non-current [Abstract]      
Deferred tax assets 1,764,000 2,434,000  
Deferred tax liability (13,301,000) (11,058,000)  
Valuation allowance (447,000) (1,470,000)  
Non-current deferred tax liability, net (11,984,000) (10,094,000)  
Net deferred tax liabilities (10,660,000) (9,040,000)  
Decrease in valuation allowance 1,023,000    
Income tax liability in Saudi Arabia $ 0 $ 0 $ 0