Annual report pursuant to Section 13 and 15(d)

Concentrations (Details)

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Concentrations (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Nov. 30, 2011
Dec. 31, 2013
Nov. 30, 2012
Risks and Uncertainties [Abstract]        
Percentage of investments in securities of energy infrastructure companies in relation to aggregate assets     8.21%  
Term of contract     10 years  
Natural gas contract with Mowood, expiration year     2015  
Revenue related to the DOD contract 84.00% 88.00% 80.00% 71.00%
Percentage of amounts due from the department of defense in relation to consolidated accounts receivable 79.00%   91.00% 84.00%
Percentage of payment to supplier of natural gas in relation to cost of sales 58.00%   41.00% 29.00%