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Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 29, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 28, 2016
Debt (Textual)        
Outstanding balances under revolver   $ 2,603 $ 2,487  
Annual maturities of long term debt in 2019   3,075    
Annual maturities of long term debt in 2020   21    
Annual maturities of long term debt in 2021   $ 11    
Sterling National Bank [Member]        
Debt (Textual)        
Aggregate amount of credit facility       $ 8,500
Subordinated indebtedness, description   (i) the minimum liquidity described above and (ii) a leverage ratio of not more than 2.0 to 1.0 for any fiscal month    
Sterling facility, maturity date   Dec. 31, 2019    
Loan and Security Agreement, describtion The Company and Sterling entered into a certain Second Amendment to Loan and Security Agreement (the "Second Amendment"), which replaced the existing fixed charge coverage ratio covenant with a minimum liquidity covenant. That covenant obligates the Company to not permit the sum of its unrestricted cash (as described in the Second Amendment) plus availability under the Revolver to drop below $2,000,000 at any time.      
Term Loan Credit Facility [Member] | Sterling National Bank [Member]        
Debt (Textual)        
Aggregate amount of credit facility       3,500
Interest on revolver - margin   4.50%    
Term loan amortize rate   $ 19    
Variable rate basis, description   Interest on the Term Loan also is variable, based upon the 30-day LIBOR rate (2.52% at December 31, 2018) plus a margin of 4.50%    
Revolving Credit Facility [Member] | Sterling National Bank [Member]        
Debt (Textual)        
Aggregate amount of credit facility       $ 5,000
Interest on revolver - margin   4.00%    
Variable rate basis, description   Interest on the Revolver is variable, based upon the 30-day LIBOR rate (2.52% at December 31, 2018) plus a margin of 4.00%