Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (735)	$ (1,073)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	296	188
Accretion of asset retirement obligation	51	49
Loss on trading securities	6
Asset write off	7
Gain on reduction of asset retirement obligation		(56)
Gain on sale of assets	(1,115)	(115)
Warrant liability fair market adjustment		100	$ (17,100)
Stock compensation	15	65
Changes in operating assets and liabilities:
Decrease in trade accounts receivable	(88)	(193)
Increase in prepaid expenses and other assets	(105)	137
Decrease in inventories	(17)	(24)
(Increase) decrease in value added tax recoverable, net	127	(6)
Decrease in deferred revenue	(72)
Decrease in reclamation liability	(3)	2
Increase (decrease) in accounts payable and accrued liabilities	(119)	(56)
Decrease in deferred leasehold payments	(8)	(5)
Net cash used in operating activities	$ (1,760)	$ (1,087)