Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Details)

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INCOME TAXES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current federal benefit $ (19,190) $ 0 $ (74)
Current state expense 86 91 31
Deferred federal expense (benefit) 15,140 (3,564) (813)
Deferred state expense (benefit) 1 (93) 210
Income tax expense (benefit) (3,963) (3,566) (646)
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income taxes at U.S. statutory rate 211 (3,455) (661)
State taxes, net of federal benefit 71 256 234
Net operating loss carryback (4,655) 0 0
Research and development credits (518) (203) (263)
Permanent and other items 928 (164) 44
Income tax expense (benefit) (3,963) (3,566) $ (646)
Deferred tax liabilities:      
Plant, pipeline and equipment (31,119) (29,227)  
Other assets (31) (32)  
Operating lease asset (2,211) (2,838)  
Total deferred tax liabilities (33,361) (32,097)  
Deferred tax assets:      
Net operating loss carryforward 0 11,685  
Intangible assets 3,396 3,699  
Operating lease liability 2,211 2,838  
Stock-based compensation 956 1,093  
Investment in AMAK 0 589  
Accounts receivable 65 240  
Mineral interests 226 226  
Interest expense carryforward 0 211  
General business credit 0 140  
Inventory 146 111  
Post-retirement benefits 70 71  
Charitable contributions 0 45  
Gross deferred tax assets 7,070 20,948  
Valuation allowance (226) (226)  
Total net deferred tax assets 6,844 20,722  
Net deferred tax liabilities $ (26,517) $ (11,375)