Acquisitions and Divestitures - Purchase Price Allocation and Other Disclosures (Details)					0 Months Ended	12 Months Ended
	Jun. 30, 2012 USD ($)	Sep. 02, 2011 USD ($)		Jun. 30, 2011 USD ($)	Sep. 06, 2011 Lease Purchase and Sale and Participation Agreement with VAALCO Energy USD ($)	Jun. 30, 2012 Santos Sales Agreement USD ($)	Jun. 30, 2012 Nautilus Purchase and Sale Agreement (PSA) USD ($)	Sep. 23, 2011 Nautilus Purchase and Sale Agreement (PSA)	Sep. 02, 2011 Nautilus Purchase and Sale Agreement (PSA) USD ($)		Sep. 02, 2011 NT non-controlling interest in NP USD ($)		Sep. 02, 2011 NT working interest in Poplar USD ($)		Sep. 02, 2011 ER non-controlling interest in NP USD ($)		Sep. 02, 2011 Maximum Nautilus Purchase and Sale Agreement (PSA) USD ($)	Sep. 02, 2011 J. Thomas Wilson Nautilus Purchase and Sale Agreement (PSA)	May 25, 2012 Mereenie Operating Joint Venture Santos Sales Agreement	May 25, 2012 Mereenie Pipeline Joint Venture Santos Sales Agreement	May 25, 2012 Palm Valley Joint Venture Santos Sales Agreement	May 25, 2012 Dingo Joint Venture Santos Sales Agreement	Jul. 22, 2011 Evans Shoal AUD	Jun. 30, 2010 Evans Shoal
Disposal Group, Other Information [Abstract]
Equity Method Investment, Ownership Percentage																								40.00%
Disposal Group, Refund Received for Deposit																							10,000,000
Ownership Interest Sold																			35.00%	35.00%
Ownership Interest Sold by Third Party																					48.00%	66.00%
Goodwill, Written off Related to Sale of Business Unit						2,521,000
Working Interest Sold					65.00%
Disposal Group, Cost of Disposed Entity [Abstract]
Consideration received, net purchase price per Santos SA					5,000,000	25,493,000
Consideration received, purchase price adjustments						1,138,000
Transaction costs					(162,000)
Consideration received total						26,631,000
Disposal Group, Consideration Received Allocation [Abstract]
Allocation of the consideration received, proved oil and gas properties (Palm Valley)						3,403,000
Allocation of the consideration received, unproved oil and gas properties (Dingo)						2,957,000
Allocation of the consideration received, land, buildings, and equipment (Palm Valley)						370,000
Total allocation of the fair value received						6,730,000
Mereenie liabilities given up, net						2,805,000
Net book value allocated to Deep Intervals					(829,000)
Gain on sale of assets					4,009,000	36,166,000
Business Acquisition, Cost of Acquired Entity [Abstract]
Consideration paid to Sellers, cash consideration		4,000,000	[1]						4,000,000	[1]	1,920,000	[1]	823,000	[1]	1,257,000	[1]
Consideration paid to Sellers, share consideration		1,822,000	[1],[2]						2,000,000		907,000	[1],[2]	389,000	[1],[2]	526,000	[1],[2]
Consideration paid to Sellers, fair value of contingent consideration payable		4,151,000	[1]								1,993,000	[1]	854,000	[1]	1,304,000	[1]	5,000,000
Consideration paid to Sellers, total		9,973,000	[1]								4,820,000	[1]	2,066,000	[1]	3,087,000	[1]
Share Consideration Paid, Par Value									$ 0.01
Share Consideration Paid, Shares								1,182,742
Related Party Interest in Cash Consideration Paid																		52.00%
Contingent consideration payable	4,072,000			0			4,070,000
Share Consideration Paid, Per Share									$ 1.54
Business Acquisition, Purchase Price Allocation [Abstract]
Recognized amount of identifiable assets acquired and liabilities assumed for Business combination, oil and gas assets (proved)		1,462,000
Recognized amount of identifiable assets acquired and liabilities assumed for Business combination, oil and gas assets - Deep Intervals (unproved)		679,000
Recognized amount of identifiable assets acquired and liabilities assumed for Business combination, ARO liability		(75,000)
Recognized amount of identifiable assets acquired and liabilities assumed for Business combination, total		$ 2,066,000

[1] Excludes transaction costs.

[2] Common stock valued at $1.54 per share closing price on the date of the transaction.