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10. Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenues $ 50,619 $ 45,028 $ 92,507 $ 88,046
Cost of goods sold 47,346 42,260 89,585 83,412
Gross profit 3,273 2,768 2,922 4,634
Other Expenses        
Research and development expenses 90 55 123 117
Selling, general and administrative expenses 3,945 3,589 8,186 7,396
Interest expense 6,586 5,351 12,795 14,379
Accretion of Series A preferred units 471 0 920 0
Loss contingency on litigation 6,200 0 6,200 0
Other (income) expense (89) (5) (712) 63
Income (loss) before income taxes (13,930) (6,222) (24,590) (17,321)
Capital expenditures 440 775 1,038 1,771
Depreciation 1,096 1,149 2,234 2,299
North America        
Revenues 39,486 39,628 76,122 76,804
Cost of goods sold 38,483 37,079 75,450 73,061
Gross profit 1,003 2,549 672 3,743
Other Expenses        
Research and development expenses 90 55 123 117
Selling, general and administrative expenses 3,190 3,420 7,256 6,935
Interest expense 6,470 5,199 12,512 14,083
Accretion of Series A preferred units 471 0 920 0
Loss contingency on litigation 6,200 0 6,200 0
Other (income) expense (74) (2) 37 43
Income (loss) before income taxes (15,344) (6,123) (26,376) (17,435)
Capital expenditures 234 567 585 1,057
Depreciation 947 992 1,941 1,984
India        
Revenues 11,133 5,400 16,385 11,242
Cost of goods sold 8,863 5,181 14,135 10,351
Gross profit 2,270 219 2,250 891
Other Expenses        
Research and development expenses 0 0 0 0
Selling, general and administrative expenses 755 169 930 461
Interest expense 116 152 283 296
Accretion of Series A preferred units 0 0 0 0
Loss contingency on litigation 0 0 0 0
Other (income) expense (15) (3) (749) 20
Income (loss) before income taxes 1,414 (99) 1,786 114
Capital expenditures 206 208 453 714
Depreciation $ 149 $ 157 $ 293 $ 315