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Asset Retirement Obligations	12 Months Ended
	Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	8.  Asset Retirement Obligations Currently, we have various legal requirements related to operations at our chemical facilities, including the disposal of wastewater generated at certain of these facilities.  Currently, there is insufficient information to estimate the fair value for certain of our asset retirement obligations (“ARO”). As a result, a liability for only certain AROs has been established.  However, we will continue to review these obligations and record a liability when a reasonable estimate of the fair value can be made.  As the result of the sale of Zena’s working interests in certain natural gas properties during 2017, our previously recognized AROs of approximately $193,000 associated with the obligation to plug and abandon wells were extinguished and derecognized with the offset included in the net loss on the sale of a business classified as operating other expense.  At December 31, 2017 and 2016, our accrued liability for AROs was $100,000 and $546,000, respectively.

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- Definition

The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-URI http://asc.fasb.org/subtopic&trid=2175671

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