CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 1,870,000	$ 1,577,000
Marketable securities		415,000
Assets held for sale		1,545,000
Prepaid and other current assets	491,000	643,000
Total Current Assets	2,361,000	4,180,000
Property, plant and equipment, at cost:
Property, plant and equipment	91,746,000	91,772,000
Less accumulated depreciation and depletion	(71,409,000)	(71,219,000)
Net property, plant and equipment	20,337,000	20,553,000
Operating lease right-of-use assets	484,000
Restricted cash	3,797,000	3,732,000
Assets held for sale, non-current		1,493,000
Total Assets	26,979,000	29,958,000
Current Liabilities:
Accounts payable	852,000	776,000
Accrued liabilities	1,770,000	1,688,000
Current portion of asset retirement obligations	894,000	708,000
Operating lease liability - current	153,000
Total Current Liabilities	3,669,000	3,172,000
Asset retirement obligations, net of current portion	5,406,000	5,495,000
Other long-term liabilities	500,000	500,000
Operating lease liability - current	340,000
Total Liabilities	9,915,000	9,167,000
Commitments and Contingencies
Stockholders’ Equity:
Common stock, 100,000,000 shares authorized, $.001 par value; Issued shares - 3,339,541 and 1,436,555 respectively Outstanding shares - 3,339,380 and 1,436,394 respectively	3,000	1,000
Paid-in capital	319,758,000	313,012,000
Accumulated other comprehensive loss		(90,000)
Accumulated deficit	(302,439,000)	(291,874,000)
Less: Treasury stock (161 and 161 shares, respectively), at cost	(258,000)	(258,000)
Total Stockholders’ Equity	17,064,000	20,791,000
Total Liabilities and Stockholders’ Equity	$ 26,979,000	$ 29,958,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).