CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 1,019	$ 1,577
Marketable securities		415
Assets held for sale	1,617	1,545
Prepaid and other current assets	722	643
Total Current Assets	3,358	4,180
Property, plant and equipment, at cost:
Property, plant and equipment	91,771	91,772
Less accumulated depreciation and depletion	(71,242)	(71,219)
Net property, plant and equipment	20,529	20,553
Operating lease right-of-use assets	569
Restricted cash	3,750	3,732
Assets held for sale - non-current		1,493
Total Assets	28,206	29,958
Current Liabilities:
Accounts payable	969	776
Accrued liabilities	2,038	1,688
Asset retirement obligations - current	894	708
Operating lease liability - current	151
Total Current Liabilities	4,052	3,172
Asset retirement obligations, net of current portion	5,100	5,495
Other long-term liabilities and deferred credits	500	500
Operating lease liability, net of current	424
Total Liabilities	10,076	9,167
Stockholders' Equity:
Common stock, 100,000,000 shares authorized, $.001 par value; Issued shares - 1,494,314 and 1,436,555, respectively; Outstanding shares -1,494,153 and 1,436,394, respectively	1	1
Paid-in capital	313,435	313,012
Accumulated other comprehensive loss		(90)
Accumulated deficit	(295,048)	(291,874)
Treasury stock (161 and 161 shares, respectively), at cost	(258)	(258)
Total Stockholders' Equity	18,130	20,791
Total Liabilities and Stockholders' Equity	$ 28,206	$ 29,958