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, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2018
Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Current federal provision (benefit) $ (74,000) $ (1,202,000) $ 1,691,000  
Current state provision 31,000 282,000 18,000  
Deferred federal provision (benefit) (974,000) (6,320,000) 8,645,000  
Deferred state provision 210,000 81,000 150,000  
Zakat and income tax benefit (expense) $ (807,000) (7,159,000) 10,504,000  
Income tax expense or liability in Saudi Arabia   $ 0 $ 0 $ 802,000
Income taxes at U.S. statutory rate 21.00% 35.00% 35.00%  
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income taxes at U.S. statutory rate $ (822,000) $ 3,885,000 $ 10,476,000  
State taxes, net of federal benefit 234,000 235,000 285,000  
Net operating loss carryback 0 (961,000) 0  
Research and development credits (263,000) 0 0  
Permanent and other items 44,000 (11,000) (257,000)  
Deferred tax impact of US tax reform 0 (10,307,000) 0  
Zakat and income tax benefit (expense) (807,000) (7,159,000) $ 10,504,000  
Deferred tax liabilities:        
Plant, pipeline and equipment (25,169,000) (17,014,000)    
Intangible assets (1,075,000) (778,000)    
Other assets (40,000) (4,000)    
Investment in AMAK (671,000) (1,023,000)    
Total deferred tax liabilities (26,955,000) (18,819,000)    
Deferred tax assets:        
Accounts receivable 238,000 198,000    
Inventory 133,000 156,000    
Mineral interests 226,000 226,000    
Foreign tax credit 802,000 0    
Net operating loss carryforward 9,073,000 0    
Post-retirement benefits 79,000 252,000    
Stock-based compensation 954,000 971,000    
Gross deferred tax assets 11,505,000 1,803,000    
Valuation allowance (226,000) (226,000)    
Total net deferred tax assets 11,279,000 1,577,000    
Net deferred tax liabilities (15,676,000) (17,242,000)    
Change in valuation allowance   0    
Interest or penalties related to uncertain tax positions $ 0 $ 0    
Scenario, Plan        
Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Income taxes at U.S. statutory rate 21.00%