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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

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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 305 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84242212&loc=d3e2352-115587 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 + Details
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