Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

v2.4.0.6
Income Taxes - Additional Information (Details) (USD $)
 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Income Taxes [Line Items]      
Valuation Allowance, Deferred Tax Asset, Change in Amount $ 9,400,000    
Undistributed Earnings of Foreign Subsidiaries, Not Expected to be Permanently Reinvested in Foreign Countries 20,000,000    
Income Tax Expense (Benefit) (5,951,000) 5,141,000 2,646,000
Australian petroleum resource rent tax 5,951,000 0  
Starting base tax shield for Petroleum Resource Rent Tax 16,600,000    
Undistributed Earnings of Foreign Subsidiaries 20,000,000    
General and administrative 13,091,000 16,307,000 14,023,000
Accumulated deficit (29,590,000) (56,073,000)  
Subsequent Event | Internal Revenue Service (IRS)
      
Income Taxes [Line Items]      
Income Tax Examination, Increase (Decrease) in Foreign Tax Credit Carryforwards 500,000    
Withholding Tax | Adjustment
      
Income Taxes [Line Items]      
General and administrative 900,000    
Withholding Tax | Error Impact, Prior Years
      
Income Taxes [Line Items]      
General and administrative 900,000    
Accumulated deficit $ (900,000)    
Maximum | Withholding Tax | Error Impact, Prior Years
      
Income Taxes [Line Items]      
Earnings Per Share, Basic and Diluted $ 0.02