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8. Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues $ 43,018 $ 31,574
Cost of goods sold 41,152 32,161
Gross profit 1,866 (587)
Expenses    
Research and development expenses 62 86
Selling, general and administrative expenses 3,807 3,295
Interest rate expense 9,028 4,525
Other expense 68 28
Income (loss) before income taxes (11,099) (8,521)
Capital expenditures 996 44
Depreciation 1,150 1,146
North America    
Revenues 37,176 29,953
Cost of goods sold 35,982 30,649
Gross profit 1,194 (696)
Expenses    
Research and development expenses 62 86
Selling, general and administrative expenses 3,515 3,024
Interest rate expense 8,884 4,557
Other expense 45 49
Income (loss) before income taxes (11,312) (8,412)
Capital expenditures 490 43
Depreciation 992 998
India    
Revenues 5,842 1,621
Cost of goods sold 5,170 1,512
Gross profit 672 109
Expenses    
Research and development expenses 0 0
Selling, general and administrative expenses 292 271
Interest rate expense 144 (32)
Other expense 23 (21)
Income (loss) before income taxes 213 (109)
Capital expenditures 506 1
Depreciation $ 158 $ 148