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Consolidated Of Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Sales (note 14) $ 144,568 $ 150,000 $ 158,406
Cost of sales (151,913) (140,683) (144,433)
Gross margin (note 14) (7,345) 9,317 13,973
Selling, general and administrative expenses (16,762) (14,108) (14,875)
Stock compensation (4,714) (1,454) (1,519)
Interest expense (2,614) (2,794) (2,695)
Interest income 1,036 311
Foreign exchange gain (loss) 433 (1,047) 26
Other income 268 131 46
Gain on disposal of assets (note 5) 13,564   (8)
Loss on write-off of investment (note 5) (1,184)    
(Loss) before taxes and earnings of unconsolidated entities (17,318) (9,644) (5,052)
Recovery of (provision for) income taxes (note 13) 5,866 2,300 763
Loss from consolidated entities after income taxes (11,452) (7,344) (4,289)
Equity earnings from unconsolidated entities (note 5) 13,777 (171) (468)
Net income (loss) $ 2,325 $ (7,515) $ (4,757)
Earnings per share:      
Basic income(loss) per share (note 15) $ 0.05 $ (0.17) $ (0.12)
Diluted income (loss) per share (note 15) $ 0.05 $ (0.17) $ (0.12)
Weighted average number of common shares used in the computation of net income (loss) per share:      
Basic 49,418,228 44,356,699 39,143,912
Diluted 51,178,981 44,356,699 39,143,912
Net income (loss) $ 2,325 $ (7,515) $ (4,757)
Other comprehensive income (loss):      
Foreign currency translation adjustment 87 (171) 150
Comprehensive income (loss) $ 2,412 $ (7,686) $ (4,607)