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General Credit Agreement (Details) - Revolving Credit Line [Member] - USD ($)
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Revolving credit line maximum borrowing amount $ 3,000,000  
Borrowings under credit line $ 0 $ 0
Revolving credit line, maturity date May 05, 2016