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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Revenues $ 40,764 $ 33,059 $ 72,338 $ 66,385
Cost of goods sold 39,059 31,115 71,220 62,355
Gross profit 1,705 1,944 1,118 4,030
Research and development expenses 110 106 196 203
Selling, general and administrative expenses 3,262 2,902 6,557 5,901
Operating loss (1,667) (1,064) (5,635) (2,074)
Interest expense        
Interest rate expense 3,164 2,955 6,006 5,633
Amortization expense 1,164 1,489 2,847 2,844
Other (income) expense (8) (525) 20 (461)
Loss before income taxes (5,987) (4,983) (14,508) (10,090)
Income tax expense 0 0 6 6
Net loss (5,987) (4,983) (14,514) (10,096)
Other comprehensive income (loss)        
Foreign currency translation adjustment 29 (100) 398 (106)
Comprehensive loss $ (5,958) $ (5,083) $ (14,116) $ (10,202)
Net loss per common share        
Basic $ (0.30) $ (0.25) $ (0.74) $ (0.51)
Diluted $ (0.30) $ (0.25) $ (0.74) $ (0.51)
Weighted average shares outstanding        
Basic 19,699 19,741 19,737 19,695
Diluted 19,699 19,741 19,737 19,695