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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 11, 2020
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net loss   $ (9,086) $ (5,386)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization   962 1,098
Accretion of asset retirement obligation   249 225
Decrease (increase) in derivative at fair value, net   254 (254)
(Gain) loss on trading securities   (20) 217
Asset write off $ 0 100 19
Gain on reduction of asset retirement obligation     (63)
Gain on sale of assets   (525) (3,144)
Stock compensation   859 782
Changes in operating assets and liabilities from continuing operations:      
Decrease in lease receivable   376 33
Increase in prepaid expenses and other assets   (506) (37)
Increase in inventories   (53) (2)
Increase in other long term assets   (341) (562)
Decrease in reclamation liability   (4) (5)
(Decrease) increase in accounts payable and accrued liabilities   (810) 514
(Decrease) increase in other current liabilities   (1,156) 1,811
Increase (decrease) in deferred revenue   63 (128)
Increase in other long term liabilities   154 484
Other     3
Net cash used in operating activities   $ (9,484) $ (4,395)