Long-Term Debt (Schedule Of Long-term Debt Instruments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Note payable to a bank, with interest only payment until maturity	$ 2,400	$ 869
Less unamortized debt issuance cost	(24)	(10)
Note payable to a financial instituion, net of unamortized debt issuance cost	2,376	859
Installment notes bearing interest at the rate of 4.16% to 4.6% per annum collateralized by vehicles with monthly payments including interest, insurance and maintenance of approximately $10	102	$ 152
Interest, insurance and maintenance	$ 10
Maximum [Member]
Line of Credit Facility [Line Items]
Interest rate per annum	4.60%
Minimum [Member]
Line of Credit Facility [Line Items]
Interest rate per annum	4.16%