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Consolidated Condensed Balance Sheets (Parenthetical) (USD $) |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2012 Series A Cumulative Preferred Stock | Jun. 30, 2012 Series A Cumulative Preferred Stock
Oil and natural gas properties, excluded from amortization (in dollars) | $ 9,031,522 | $ 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 |  |
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, liquidation preference (in dollars per share) | $ 25.00 | $ 25.00 |  |
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 | 28,897,133 | 28,670,424 |  |
Common stock, outstanding shares | 28,106,796 | 27,882,224 |  |
Treasury stock, shares | 790,337 | 788,200 |  |

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