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Consolidated Statements Of Cash Flow - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net income (loss) $ 2,325 $ (7,515) $ (4,757)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:      
Depreciation and amortization 7,366 7,027 7,659
Amortization of deferred charges 76 76  
(Gain) loss on disposal of assets (note 5) (13,564)   8
Loss on write-off of investment in joint venture (note 5) 1,184    
Share of (income) loss from joint venture (note 8) (13,777) 170 470
Interest expense 2,614 2,794 2,695
Interest income (1,036) (311)
Share-based compensation 4,714 1,454 1,519
Lease payments (1,043)    
Deferred income taxes (5,855) (2,730) (792)
Interest paid on long-term debt (2,635) (2,417) (2,614)
Changes in non-cash working capital items (note 17) 5,244 (3,149) (3,519)
Net cash (used in) provided by operating activities (14,387) (4,677) 669
Cash flows from investing activities:      
Purchases of property, plant and equipment (2,287) (3,093) (1,696)
Investment in joint venture (96)    
Notes receivable loaned to joint ventures (note 11) (14,507) (10,462)  
Proceeds from sale of land 52 65  
Net cash used in investing activities (16,838) (13,490) (1,696)
Cash flows from financing activities:      
Proceeds from borrowings 4,000 7,000 7,306
Repayments on borrowings (7,423) (7,706) (14,320)
Proceeds from issuance of common stock, net 34,226 23,492 9,769
Proceeds from exercise of stock options 208 283 59
Proceeds from exercise of warrants 466    
Payments lease obligations (90) (71) (59)
Net cash provided by financing activities 31,387 22,998 2,755
Effect of exchange rate changes on cash and cash equivalents (93) (2) (10)
Increase in cash and cash equivalents 69 4,829 1,718
Cash and cash equivalents, beginning of year 11,920 7,091 5,373
Cash and cash equivalents, end of year 11,989 11,920 7,091
Supplemental cash flow information:      
Income taxes paid (recovered) $ 904 $ 290 (25)
Supplemental disclosure of non-cash information:      
Purchases of capital expenditures by financing capital lease     190
Issuance of warrants     $ 148