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Condensed Consolidated Interim Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows used in operating activities:    
Net income $ 4,071 $ 10,182
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,021 3,766
Amortization of deferred charges 38 38
Share of income from joint ventures (3,579) (10,593)
Interest expense 974 1,363
Interest income (476) (347)
Interest paid on long-term debt (1,018) (1,063)
Gain on settlement agreement (4,681)  
Loss (gain) on disposal of assets 6 (13,564)
Non-cash lease expense (627) (513)
Interest paid on finance leases (2) (4)
Share-based compensation 857 1,997
Deferred income taxes (400) 1,144
Changes in non-cash working capital items 3,961 (1,843)
Net cash provided by (used) in operating activities 2,145 (9,437)
Cash flows used in investing activities:    
Purchases of property, plant and equipment, net of rebate (452) (730)
Advances to joint ventures (125) (5,806)
Proceeds from sale of asset   60
Investment in joint ventures (11,713) (13)
Net cash used in investing activities (12,290) (6,489)
Cash flows from financing activities:    
Proceeds from borrowings 3,000 3,000
Repayments on borrowings (2,652) (1,709)
Proceeds from issuance of common stock 7,957 13,928
Issuance costs (663)  
Proceeds from exercise of stock options 122 75
Payments on capital lease obligations (39) (48)
Proceeds from exercise of warrants   466
Net cash provided by financing activities 7,725 15,712
Effect of exchange rate changes on cash and cash equivalents (1)  
Net decrease in cash and cash equivalents (2,421) (214)
Cash and cash equivalents, beginning of period 11,989 11,920
Cash and cash equivalents, end of period $ 9,568 $ 11,706