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Subsequent Events (Details Textual) (USD $)
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1 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Feb. 28, 2013
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Dec. 18, 2012
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Dec. 24, 2012
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Nov. 30, 2012
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Nov. 30, 2011
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Nov. 30, 2010
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Feb. 09, 2013
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Dec. 20, 2012
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Dec. 20, 2012
Secured Term Credit Facility [Member]
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Nov. 30, 2012
Maximum [Member]
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Nov. 30, 2012
Minimum [Member]
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Dec. 14, 2012
Prudential [Member]
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Dec. 14, 2012
Pinedale GP [Member]
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Dec. 20, 2012
Ultra Petroleum Corporation [Member]
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| Subsequent Events (Textual) [Abstract] | ||||||||||||||
| Acquisition consideration, cash | $ 205,000,000 | |||||||||||||
| Acquisition consideration, certain investment securities | 23,000,000 | |||||||||||||
| Annual rent for initial term under Lease Agreement | 27,500,000 | 20,000,000 | ||||||||||||
| Acquisition by contributing in cash and certain equity securities | 30,000,000 | 108,310,000 | ||||||||||||
| Percentage of Economic Interest Held by Partners | 18.95% | 81.05% | ||||||||||||
| Loan facility secured by assets | 10,000,000 | 70,000,000 | ||||||||||||
| Variable annual rate equal to LIBOR plus | 3.25% | |||||||||||||
| Public offering | 13,000,000 | 1,950,000 | ||||||||||||
| Subsequent Events (Additional Textual) [Abstract] | ||||||||||||||
| Gross proceeds | 78,000,000 | |||||||||||||
| Common stock price per share | $ 6.00 | $ 6.00 | ||||||||||||
| Net proceeds after underwriters' discount | 73,600,000 | 11,040,000 | ||||||||||||
| Amount of net proceeds used from offering to finance acquisition | $ 73,600,000 | |||||||||||||
| Margin loan agreement termination date | Dec. 20, 2012 | |||||||||||||
| Dividends declared per share | $ 0.125 | $ 0.44 | $ 0.41 | $ 0.43 | ||||||||||
| Dividend declared date | Feb. 05, 2013 | |||||||||||||
| Dividend paid date | Mar. 19, 2013 | |||||||||||||
| Dividend record date | Mar. 08, 2013 | |||||||||||||