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Concentrations (Details)
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3 Months Ended | 6 Months Ended | ||||
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Jun. 30, 2013
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May 31, 2012
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Feb. 29, 2012
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Jun. 30, 2013
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May 31, 2012
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Dec. 31, 2012
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| Risks and Uncertainties [Abstract] | ||||||
| Percentage of investments in securities of energy infrastructure companies in relation to aggregate assets | 7.36% | |||||
| Term of contract | 10 years | |||||
| Natural gas contract with Mowood, expiration year | 2015 | |||||
| Revenue related to the DOD contract | 85.00% | 85.00% | 87.00% | 89.00% | ||
| Percentage of amounts due from the department of defense in relation to consolidated accounts receivable | 85.00% | 85.00% | 84.00% | |||
| Percentage of payment to supplier of natural gas in relation to cost of sales | 52.00% | 31.00% | 18.00% | 41.00% | ||
| X | ||||||||||
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- Definition
Contract term. No definition available.
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| X | ||||||||||
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- Definition
Natural gas contract expiration year. No definition available.
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- Definition
Percentage of amounts due from the department of defense in relation to consolidated accounts receivable. No definition available.
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| X | ||||||||||
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- Definition
Percentage of payment to supplier of natural gas in relation to cost of sales. No definition available.
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| X | ||||||||||
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- Definition
Percentage of revenue related to the department of defense contract. No definition available.
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| X | ||||||||||
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- Definition
For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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