Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
INVESTMENT IN AL MASANE AL KOBRA MINING COMPANY ("AMAK") (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
ر.س / $
shares
Jul. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
ر.س / $
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Oct. 31, 2018
shares
Jul. 31, 2016
ر.س / shares
shares
Jul. 30, 2016
Schedule of Equity Method Investments [Line Items]                
Foreign exchange rate (SR per USD) | ر.س / $ 3.75   3.75          
Results of Operations [Abstract]                
Operating income (loss)     $ 2,335,000 $ 18,102,000 $ 18,707,000      
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]                
Equity in loss of AMAK     (901,000) (4,261,000) (1,479,000)      
Gain from equity issuance by AMAK     $ 0 $ 0 3,168,000      
Common stock, shares outstanding (in shares) | shares 24,500,000   24,500,000 24,300,000        
AMAK                
Schedule of Equity Method Investments [Line Items]                
Investment in AMAK $ 38,700,000   $ 38,700,000 $ 45,100,000        
Foreign exchange rate (SR per USD) | ر.س / $ 3.75   3.75          
Results of Operations [Abstract]                
Sales     $ 70,234,000 36,435,000 9,921,000      
Cost of sales     (68,084,000) (43,304,000) (27,132,000)      
Gross loss     2,150,000 (6,869,000) (17,211,000)      
General, administrative and other expenses     8,879,000 9,903,000 9,690,000      
Operating income (loss)     (6,729,000) (16,772,000) (26,901,000)      
Gain on settlement with former operator     0 0 17,425,000      
Net loss     (6,729,000) (16,772,000) (9,476,000)      
Depreciation and amortization     33,469,000 22,419,000 11,672,000      
Net income before depreciation and amortization     26,740,000 5,648,000 2,196,000      
Equity Method Investment, Summarized Financial Information [Abstract]                
Current assets $ 44,093,000   44,093,000 23,333,000        
Noncurrent assets 212,291,000   212,291,000 237,875,000        
Total assets 256,384,000   256,384,000 261,208,000        
Current liabilities 17,160,000   17,160,000 24,439,000        
Long term liabilities 77,366,000   77,366,000 68,837,000        
Shareholders' equity 161,858,000   161,858,000 167,932,000        
Total liabilities and equity $ 256,384,000   256,384,000 261,208,000        
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]                
AMAK Net Loss     (6,729,000) (16,772,000) (9,476,000)      
Zakat tax applicable to Saudi Arabian shareholders only     0 0 320,000      
AMAK Net Loss before Saudi Arabian shareholders' portion of Zakat     (6,729,000) (16,772,000) (9,156,000)      
Company's share of loss reported by AMAK (33.41% beginning July 10, 2016 and 35.25% prior to July 10, 2016)     (2,248,000) (5,608,000) (2,826,000)      
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK     1,347,000 1,347,000 1,347,000      
Equity in loss of AMAK     (901,000) (4,261,000) (1,479,000)      
Gain upon formation of AMAK     $ 16,200,000          
Issued to employees (in shares) | shares   4,000,000            
Percentage investment in AMAK 100.00% 33.44% 100.00%       33.44% 35.25%
Gain from equity issuance by AMAK   $ 3,200,000            
Stock exchanged during period (in shares) | shares     24,489          
Approved repurchase amount (in shares) | shares           2,500,000.0    
Return on investment $ 5,300,000              
Percentage of shares to be repurchased 10.00%              
Common stock, shares outstanding (in shares) | shares 82,000,000   82,000,000          
Amount receivable for unreimbursed travel expenses $ 54,000   $ 54,000 121,000        
Impairment charges recorded     $ 0 $ 0 $ 0      
AMAK | Various Saudi shareholders                
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]                
Percentage investment in AMAK 46.73%   46.73%          
AMAK | Trecora Resources                
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]                
Percentage investment in AMAK 33.41%   33.41%          
AMAK | Armico                
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]                
Percentage investment in AMAK 19.86%   19.86%          
Arab Mining Co                
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]                
Issued to employees (in shares) | shares   3,750,000            
Share price (in SR and dollars per share) | (per share)   $ 5.33         ر.س 20.00  
Reserved for future issuance (in shares) | shares   250,000         250,000  
Treasury Stock                
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]                
Stock exchanged during period (in shares) | shares     65,000