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8. Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues $ 45,028 $ 40,764 $ 88,046 $ 72,338
Cost of goods sold 42,260 39,059 83,412 71,220
Gross profit 2,768 1,705 4,634 1,118
Expenses        
Research and development expenses 55 110 117 196
Selling, general and administrative expenses 3,589 3,262 7,396 6,557
Interest rate expense 5,351 4,328 14,379 8,853
Other expense (5) (8) 63 20
Income (loss) before income taxes (6,222) (5,987) (17,321) (14,508)
Capital expenditures 775 467 1,771 511
Depreciation 1,149 1,152 2,299 2,298
North America        
Revenues 39,628 35,465 76,804 65,418
Cost of goods sold 37,079 34,359 73,061 65,008
Gross profit 2,549 1,106 3,743 410
Expenses        
Research and development expenses 55 110 117 196
Selling, general and administrative expenses 3,420 2,867 6,935 5,891
Interest rate expense 5,199 4,271 14,083 8,828
Other expense (2) (11) 43 38
Income (loss) before income taxes (6,123) (6,131) (17,435) (14,543)
Capital expenditures 567 340 1,057 383
Depreciation 992 997 1,984 1,995
India        
Revenues 5,400 5,299 11,242 6,920
Cost of goods sold 5,181 4,700 10,351 6,212
Gross profit 219 599 891 708
Expenses        
Research and development expenses 0 0 0 0
Selling, general and administrative expenses 169 395 461 666
Interest rate expense 152 57 296 25
Other expense (3) 3 20 (18)
Income (loss) before income taxes (99) 144 114 35
Capital expenditures 208 127 714 128
Depreciation $ 157 $ 155 $ 315 $ 303