ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)	1 Months Ended		12 Months Ended
	Aug. 31, 2009	May 31, 2009	Jun. 30, 2012 subsidiary	Jun. 30, 2011	Jun. 30, 2010	Feb. 02, 2012	Nov. 30, 2010	Jun. 30, 2009	Apr. 01, 2009 item
Nature of business
Number of wholly-owned subsidiaries			3
Cash and cash equivalents
Cash in excess of FDIC limits			$ 35,728,000
Restricted cash
Restricted cash in escrow account under contract			19,180,000
Joint interest receivable and allowance for doubtful accounts
Dana's interest in the Guinea Concession (as a percent)			23.00%
Oil and Gas Properties
Discount percentage			10.00%
Amortization of proved oil and gas properties subject to the full-cost ceiling test			116,312,000
Sales of Oil and Gas Properties and Discontinued Operations
Number of sales in a transaction to sell the working interest in all of domestic oil and gas properties									3
First schedule payment received on sale of oil and gas properties		1,030,000
Second schedule payment received on sale of oil and gas properties		820,000
Final payment received on sale of oil and gas properties	820,000
Deferred Rent
Period of reversal of deferred rent			12 months
Amortized deferred rent				138,000			140,000
Earnings per Share
Common shares that can be purchased upon exercise of options			12,495,316	9,274,854	8,048,760			2,219,707
Average exercise price of common stock (in dollars per share)			$ 2.09	$ 1.85	$ 0.91			$ 3.27
Warrants that can be purchased			13,400,000	3,900,000	11,100,000
Average exercise price of warrants (in dollars per share)			$ 2.94	$ 1.26	$ 1.25	$ 3.50
Common shares that can be purchased using the treasury stock method, had there been net income			2,800,000	3,700,000	900,000
Common shares that can be purchased using the treasury stock method, had there been net income			1,700,000	2,700,000	600,000
Gross Value
Accumulated other comprehensive loss at the beginning of the period			349,000
Change in fair value of available-for-sale securities			123,000	349,000
Reclassification of other than temporary impairment of securities included in net income, gross			(472,000)
Accumulated other comprehensive loss at the end of the period				349,000
Net of Tax Value
Accumulated other comprehensive loss at the beginning of the period			(349,000)
Change in fair value of available-for-sale securities			123,000	349,000
Reclassification of other than temporary impairment of securities included in net income, net			(472,000)
Accumulated other comprehensive loss at the end of the period				(349,000)
Total comprehensive loss			$ 149,000,000	$ 11,600,000
Minimum
Property, Plant and Equipment, Other than Oil and Gas
Estimated useful lives of the assets			3 years
Income Taxes
Percentage of likelihood of realization that the tax position must exceed in order for the amount to be recognized in the financial statements			50.00%
Earnings per Share
Average exercise price of warrants (in dollars per share)				$ 0.98
Maximum
Cash and cash equivalents
Term of original maturity to classify highly liquid investments as cash and cash equivalents			3 months
Property, Plant and Equipment, Other than Oil and Gas
Estimated useful lives of the assets			5 years
Earnings per Share
Average exercise price of warrants (in dollars per share)				$ 1.58