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Capital Notes (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jan. 25, 2017
Debt Instrument [Line Items]      
Proceeds used to pay off debt   $ 10,000,000  
Capital note proceeds $ 5,000,000    
2017 Notes [Member]      
Debt Instrument [Line Items]      
Capital note issued     $ 5,000,000
Capital notes, interest rate     4.00%
Capital notes, maturity date Jan. 24, 2022    
Capital Notes 4% Due 1/24/2022 [Member]      
Debt Instrument [Line Items]      
Capital notes, interest rate 4.00%    
Capital notes, maturity date Jan. 24, 2022