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11. Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenues $ 150,157 $ 143,158
Cost of goods sold 146,782 131,559
Gross profit 3,375 11,599
Expenses    
Research and development expenses 2,367 369
Selling, general and administrative expenses 13,191 12,011
Interest expense 19,304 17,216
Gain on debt extinguishment 0 (2,033)
Other (income) expense 277 (334)
Loss before income taxes (31,764) (15,630)
Capital Expenditures 1,116 629
Depreciation 4,622 4,670
Total Assets 94,331 77,810
North America    
Revenues 136,739 128,706
Cost of goods sold 133,606 117,040
Gross profit 3,133 11,666
Expenses    
Research and development expenses 2,367 369
Selling, general and administrative expenses 12,134 10,912
Interest expense 18,991 16,957
Gain on debt extinguishment   0
Other (income) expense 328 (254)
Loss before income taxes (30,687) (16,318)
Capital Expenditures 802 198
Depreciation 4,001 4,067
Total Assets 80,479 67,279
India    
Revenues 13,418 14,452
Cost of goods sold 13,176 14,519
Gross profit 242 (67)
Expenses    
Research and development expenses 0 0
Selling, general and administrative expenses 1,057 1,099
Interest expense 313 259
Gain on debt extinguishment   (2,033)
Other (income) expense (51) (80)
Loss before income taxes (1,077) 688
Capital Expenditures 314 431
Depreciation 621 603
Total Assets $ 13,852 $ 10,531