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10. Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues $ 41,888 $ 43,018
Cost of goods sold 42,239 41,152
Gross profit (loss) (351) 1,866
Expenses    
Research and development expenses 33 62
Selling, general and administrative expenses 4,241 3,807
Interest expense 6,209 9,028
Accretion of Series A preferred units 449 0
Other (income) expense (623) 68
Loss before income taxes (10,660) (11,099)
Capital expenditures 598 996
Depreciation 1,138 1,150
North America    
Revenues 36,636 37,176
Cost of goods sold 36,967 35,982
Gross profit (loss) (331) 1,194
Expenses    
Research and development expenses 33 62
Selling, general and administrative expenses 4,066 3,515
Interest expense 6,042 8,884
Accretion of Series A preferred units 449 0
Other (income) expense 111 45
Loss before income taxes (11,032) (11,312)
Capital expenditures 351 490
Depreciation 994 992
India    
Revenues 5,252 5,842
Cost of goods sold 5,272 5,170
Gross profit (loss) (20) 672
Expenses    
Research and development expenses 0 0
Selling, general and administrative expenses 175 292
Interest expense 167 144
Accretion of Series A preferred units 0 0
Other (income) expense (734) 23
Loss before income taxes 372 213
Capital expenditures 247 506
Depreciation $ 144 $ 158