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Long-Term Debt, Interest Rate Swap and Capitalized Lease Obligations (Schedule of Long-term Debt) (Details) - USD ($)		12 Months Ended
	Feb. 26, 2016	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total		$ 88,107,000	$ 80,081,000
Less current portion		(13,065,000)	(7,715,000)
Long-term debt, excluding current maturities		75,042,000	72,366,000
Less deferred financing costs, net		(1,884,000)	(2,273,000)
Plus capitalized lease obligations		1,445,000	2,052,000
Long-term debt and capitalized lease obligations, less current portion and deferred financing costs, net		74,603,000	72,145,000
Mortgage term loan \| Amended and restated credit agreement \| LIBOR
Debt Instrument [Line Items]
Long-term debt basis spread based on LIBOR	4.00%
Acquisition loan facility \| Amended and restated credit agreement \| LIBOR
Debt Instrument [Line Items]
Long-term debt basis spread based on LIBOR	4.75%
Equipment loan
Debt Instrument [Line Items]
Total		40,000	0
Mortgages \| Amended and restated credit agreement
Debt Instrument [Line Items]
Term mortgage loan facility		72,067,000
Mortgages \| Mortgage term loan \| Amended and restated credit agreement
Debt Instrument [Line Items]
Term mortgage loan facility		$ 64,567,000	$ 58,792,000
Effective fixed interest rate percentage		5.79%	5.79%
Mortgages \| Mortgage term loan \| Amended and restated credit agreement \| LIBOR
Debt Instrument [Line Items]
Long-term debt basis spread based on LIBOR		4.00%	4.00%
Mortgages \| Acquisition loan facility \| Canadian Imperial Bank
Debt Instrument [Line Items]
Total		$ 7,500,000	$ 6,289,000
Mortgages \| Acquisition loan facility \| Canadian Imperial Bank \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		4.75%	4.75%
Mortgages \| Acquisition loan facility \| Amended and restated credit agreement
Debt Instrument [Line Items]
Term mortgage loan facility		$ 7,500,000
Effective fixed interest rate percentage		6.25%
Amended revolver \| Amended and restated credit agreement
Debt Instrument [Line Items]
Total		$ 16,000,000	$ 15,000,000
Amended revolver \| Amended and restated credit agreement \| LIBOR
Debt Instrument [Line Items]
Long-term debt basis spread based on LIBOR		4.00%	4.00%