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General Credit Agreement (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Nov. 11, 2016
Sep. 30, 2016
Dec. 31, 2015
Revolving Credit Facility [Member]        
Short-term Debt [Line Items]        
Credit line maximum borrowing amount     $ 3,000,000  
Borrowings under credit line     $ 0 $ 0
Credit line, maturity date Sep. 30, 2016      
General Credit and Security Agreement [Member]        
Short-term Debt [Line Items]        
Credit line maximum borrowing amount   $ 6,000,000    
Borrowings under credit line $ 0      
Credit line, maturity date Nov. 11, 2017