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9. Debt (Details) - USD ($)
 9 Months Ended
Sep. 29, 2017
Oct. 29, 2017
9. Debt (Details) [Line Items]    
Proceeds from Loans   $ 12,000,000
Letter of Credit [Member]    
9. Debt (Details) [Line Items]    
Letters of Credit Outstanding, Amount   1,500,000
Unsecured Debt [Member]    
9. Debt (Details) [Line Items]    
Debt Instrument, Face Amount $ 12,000,000  
Debt Instrument, Maturity Date, Description repay the principal amount borrowed under the New Unsecured Term Loan in monthly installments of approximately $143,000, together with any accrued interest, until the full amount borrowed is repaid or until the earlier of September 30, 2022 or the expiration of the Company’s existing $30 million revolving credit facility (the “Existing Revolver”), at which time all amounts outstanding under the New Unsecured Term Loan will become due and payable.  
Debt Instrument, Periodic Payment $ 143,000  
Debt Issuance Costs, Gross   39,000
Debt Issuance Costs, Net   $ 131,000
Line of Credit Facility, Covenant Terms   ·Maintain a ratio of funded debt to EBITDA not exceeding:o2.50:1.0 through August 31, 2018;o2.25:1.0 through August 31, 2019; ando2.00:1.00 thereafter.·A basic fixed charge coverage ratio of at least 1.25:1.00; and·Limit capital expenditures to no more than $15.0 million during any fiscal year with expenditures to acquire fixed assets pursuant to the Acquisition being excluded for the fiscal year in which the Acquisition occurs.
Unsecured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]    
9. Debt (Details) [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.50%  
Line of Credit [Member]    
9. Debt (Details) [Line Items]    
Line of Credit Facility, Remaining Borrowing Capacity   $ 28,500,000