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Long-Term Debt (Schedule Of Long-term Debt Instruments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]    
Revolving credit facility, with interest only payment until maturity $ 869 $ 734
Installment notes bearing interest at the rate of 5.5% to 8.25% per annum collateralized by vehicles with monthly payments including interest, insurance and maintenance of approximately $10 152 155
Total long-term debt 1,021 889
Less current maturities (65) (65)
Long-term debt, less current maturities 956 $ 824
Interest, insurance and maintenance $ 8  
Maximum [Member]    
Line of Credit Facility [Line Items]    
Interest rate per annum 8.25%  
Minimum [Member]    
Line of Credit Facility [Line Items]    
Interest rate per annum 5.50%