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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net loss $ (3,336) $ (2,351)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 279 274
Accretion of asset retirement obligation 59 55
Decrease in derivative at fair value 215  
Loss (gain) on trading securities   106
Asset write off   16
Gain on reduction of asset retirement obligation   (39)
Stock compensation 52 564
Changes in operating assets and liabilities from continuing operations:    
Decrease (increase) in lease receivable 138 (8)
Increase (decrease) in prepaid expenses and other assets 43 (62)
Increase (decrease) in inventories 53 (2)
Decrease in value added tax recoverable, net   (5)
Increase in other long term assets 96  
(Decrease) increase in reclamation liability (1) (63)
Increase in accounts payable and accrued liabilities (568) 191
Decrease in deferred revenue (118) (73)
Increase in deferred labilities (675) (10)
Decrease in other liabilities (56)  
Net cash used in operating activities $ (3,819) $ (1,407)