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8. Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues $ 44,635 $ 38,935 $ 132,681 $ 111,273
Cost of goods sold 41,967 36,980 125,379 108,200
Gross profit (loss) 2,668 1,955 7,302 3,073
Expenses        
Research and development expenses 74 1,876 191 2,072
Selling, general and administrative expenses 3,893 3,182 11,289 9,739
Interest rate expense 5,411 5,132 19,790 13,985
Other expense (61) (18) 2 2
Loss before income taxes (6,649) (8,217) (23,970) (22,725)
Capital expenditures 727 170 2,498 681
Depreciation 1,158 1,173 3,457 3,471
North America        
Revenues 38,576 36,012 115,380 101,430
Cost of goods sold 36,147 33,995 109,208 99,003
Gross profit (loss) 2,429 2,017 6,172 2,427
Expenses        
Research and development expenses 74 1,876 191 2,072
Selling, general and administrative expenses 3,645 2,941 10,580 8,832
Interest rate expense 5,261 4,978 19,344 13,806
Other expense (55) (5) (12) 33
Loss before income taxes (6,496) (7,773) (23,931) (22,316)
Capital expenditures 703 65 1,760 448
Depreciation 992 1,014 2,976 3,009
India        
Revenues 6,059 2,923 17,301 9,843
Cost of goods sold 5,820 2,985 16,171 9,197
Gross profit (loss) 239 (62) 1,130 646
Expenses        
Research and development expenses 0 0 0 0
Selling, general and administrative expenses 248 241 709 907
Interest rate expense 150 154 446 179
Other expense (6) (13) 14 (31)
Loss before income taxes (153) (444) (39) (409)
Capital expenditures 24 105 738 233
Depreciation $ 166 $ 159 $ 481 $ 462