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Consolidated Balance Sheets (Parenthetical) (USD $)
 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Oil and natural gas properties, excluded from amortization (in dollars) $ 4,112,704 $ 6,042,094
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, issued shares 29,410,858 28,670,424
Common stock, outstanding shares 28,608,969 27,882,224
Treasury stock, shares 801,889 788,200
Series A Cumulative Preferred Stock
    
Cumulative Preferred Stock (as a percent) 8.50% 8.50%
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 317,319 317,319
Preferred stock, shares outstanding 317,319 317,319
Preferred stock, total liquidation preference (in dollars) $ 7,932,975 $ 7,932,975
Preferred stock, liquidation preference (in dollars per share) $ 25.00 $ 25.00