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Manufactured Methane Facilities (Schedule Of The Manufactured Methane Facilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Methane Project [Line Items] |  |
Manufactured Methane facilities, at cost, net of impairment | $ 445 | $ 513
Accumulated depreciation | (245) | (313)
Manufactured Methane facilities, net | 200 | 200
Methane Project [Member] |  |
Methane Project [Line Items] |  |
Manufactured Methane facilities, at cost, net of impairment | 1,634 | 1,634
Accumulated depreciation | (60) |
Manufactured Methane facilities, net | $ 1,574 | $ 1,634

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