Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net loss	$ (1,945)	$ (3,892)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,171	952
Accretion of asset retirement obligation	163	196
Gain on trading securities	(92)
Asset write off	13
Gain on reduction of asset retirement obligation		(56)
Gain on sale of assets	(5,144)	(608)
Stock compensation	226	296
Changes in operating assets and liabilities:
Increase (decrease) in trade accounts receivable	(167)	683
Decrease in prepaid expenses and other assets	(10)	(142)
Increase in inventories	13	3
Decrease (increase) in value added tax recoverable, net	127	(149)
Increase (Decrease) in Deferred Revenue	(292)	892
Decrease in reclamation liability	24	(8)
Increase (decrease) in accounts payable and accrued liabilities	236	226
Decrease in deferred leasehold payments	(34)	(23)
Net cash used in operating activities	$ (5,711)	$ (1,630)