Long-Term Debt, Interest Rate Swap and Capitalized Lease Obligations (Interest Rate Swap Cash Flow Hedge) (Narrative) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Accumulated other comprehensive income	$ 709,000	$ 195,000
Interest rate swap
Derivative [Line Items]
Notional amount of interest rate swap	$ 28,565,000
Long-term debt fixed based on the interest rate swap	5.79%
Net asset of interest rate swap	$ 211,000
Accumulated other comprehensive income	131,000
Income tax benefit, interest rate swap	$ 80,000