Asset Acquisition and Assets Held for Sale (Details Textuals) - USD ($) $ in Millions	Jun. 30, 2017	Sep. 30, 2017
Business Combinations [Abstract]
Non-operated working interest acquired in asset acquisition	23.00%
Costs Incurred, Acquisition of Oil and Gas Properties	$ 71.5
Land Available-for-sale		$ 33.1

Carrying value of land held for sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a),1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2599-110228

Name:	us-gaap_LandAvailableForSale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant