Borrowings (Details Textual) € in Millions	1 Months Ended			12 Months Ended
	Jan. 21, 2016 USD ($)	Aug. 27, 2013 USD ($)	Aug. 27, 2013 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 26, 2015	Aug. 27, 2013 EUR (€)
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal				$ 313,000
Bank Overdrafts | €						€ 1.0
Short-term Debt, Weighted Average Interest Rate				2.56%	2.45%
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months				$ 1,300,000
Long-term Debt, Maturities, Repayments of Principal in Year Two				1,200,000
Long-term Debt, Maturities, Repayments of Principal in Year Three				20,400,000
Long-term Debt, Maturities, Repayments of Principal in Year Four				1,200,000
Long-term Debt, Maturities, Repayments of Principal in Year Five				1,300,000
Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Increase (Decrease) in Book Overdrafts | €			€ 1.0
Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage				2.56%
Term Loan [Member] | Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jan. 21, 2021
Seller Financed Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date				Nov. 30, 2016
Debt Instrument, Periodic Payment				$ 156,000
Senior Revolving Credit Facility [Member] | Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Increase (Decrease), Net, Total	$ 7,500,000	$ 9,000,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 35,000,000	$ 31,000,000
Debt Instrument, Maturity Date	Jan. 21, 2019	Aug. 27, 2016	Aug. 27, 2016
Debt Instrument, Interest Rate, Stated Percentage				2.37%