Quarterly report pursuant to Section 13 or 15(d)

SEGMENT INFORMATION (Details)

v3.8.0.1
SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Total revenues $ 71,741 $ 55,542  
Operating profit (loss) before depreciation and amortization 6,635 6,780  
Operating profit (loss) 3,609 4,192  
Profit (loss) before taxes 2,942 2,548  
Depreciation and amortization 3,026 2,588  
Capital expenditures 11,028 13,881  
Trade receivables 27,421   $ 25,779
Goodwill and intangible assets, net 42,141   42,606
Total assets 335,126   327,326
Product Sales [Member]      
Segment Reporting Information [Line Items]      
Total revenues 66,699 50,899  
Trade receivables 24,647   22,882
Processing Fees [Member]      
Segment Reporting Information [Line Items]      
Total revenues 5,042 4,643  
Trade receivables 2,774   2,897
Operating Segments [Member] | Petrochemical [Member]      
Segment Reporting Information [Line Items]      
Total revenues 62,313 45,879  
Operating profit (loss) before depreciation and amortization 8,393 8,214  
Operating profit (loss) 6,679 6,658  
Profit (loss) before taxes 6,054 6,005  
Depreciation and amortization 1,714 1,556  
Capital expenditures 10,283 8,756  
Goodwill and intangible assets, net 0   0
Total assets 275,063   265,213
Operating Segments [Member] | Petrochemical [Member] | Product Sales [Member]      
Segment Reporting Information [Line Items]      
Total revenues 60,285 44,391  
Trade receivables 21,495   20,211
Operating Segments [Member] | Petrochemical [Member] | Processing Fees [Member]      
Segment Reporting Information [Line Items]      
Total revenues 2,028 1,488  
Trade receivables 1,018   983
Operating Segments [Member] | Specialty Wax [Member]      
Segment Reporting Information [Line Items]      
Total revenues 9,595 9,663  
Operating profit (loss) before depreciation and amortization 390 745  
Operating profit (loss) (914) (271)  
Profit (loss) before taxes (1,181) (290)  
Depreciation and amortization 1,304 1,016  
Capital expenditures 745 5,125  
Goodwill and intangible assets, net 42,141   42,606
Total assets 117,297   117,579
Operating Segments [Member] | Specialty Wax [Member] | Product Sales [Member]      
Segment Reporting Information [Line Items]      
Total revenues 6,383 6,508  
Trade receivables 3,127   2,671
Operating Segments [Member] | Specialty Wax [Member] | Processing Fees [Member]      
Segment Reporting Information [Line Items]      
Total revenues 3,212 3,155  
Trade receivables 1,841   1,914
Corporate [Member]      
Segment Reporting Information [Line Items]      
Total revenues 0 0  
Operating profit (loss) before depreciation and amortization (2,148) (2,179)  
Operating profit (loss) (2,156) (2,195)  
Profit (loss) before taxes (1,931) (3,167)  
Depreciation and amortization 8 16  
Capital expenditures 0 0  
Goodwill and intangible assets, net 0   0
Total assets 97,543   97,880
Corporate [Member] | Product Sales [Member]      
Segment Reporting Information [Line Items]      
Total revenues 0 0  
Trade receivables 0   0
Corporate [Member] | Processing Fees [Member]      
Segment Reporting Information [Line Items]      
Total revenues 0 0  
Trade receivables 0   0
Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenues (167) 0  
Operating profit (loss) before depreciation and amortization 0 0  
Operating profit (loss) 0 0  
Profit (loss) before taxes 0 0  
Depreciation and amortization 0 0  
Capital expenditures 0 0  
Goodwill and intangible assets, net 0   0
Total assets (154,777)   (153,346)
Eliminations [Member] | Product Sales [Member]      
Segment Reporting Information [Line Items]      
Total revenues 31 0  
Trade receivables 25   0
Eliminations [Member] | Processing Fees [Member]      
Segment Reporting Information [Line Items]      
Total revenues (198) $ 0  
Trade receivables $ (85)   $ 0