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Debt (Narrative) (Details)
3 Months Ended
Mar. 29, 2019
USD ($)
Sep. 27, 2018
USD ($)
Jan. 30, 2018
USD ($)
Installment
Mar. 31, 2019
USD ($)
Dec. 31, 2017
Dec. 31, 2016
USD ($)
Revolving Line of Credit [Member] | First Choice Bank [Member]            
Debt Instrument [Line Items]            
Line of credit aggregate borrowing capacity $ 3,000,000          
Line of credit   $ 1,500,000   $ 800,000    
Debt instrument, Maturity date Apr. 05, 2020     Oct. 05, 2019    
Interest rate per annum 5.50%          
Frequency of payment       monthly payments    
Revolving Line of Credit [Member] | First Choice Bank [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Monthly interest payment   $ 100.00        
Revolving Line of Credit [Member] | First Choice Bank [Member] | Wall Street Journal prime rate [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Interest rate per annum   5.25%        
Affiliated Entity [Member] | Revolving Line of Credit [Member]            
Debt Instrument [Line Items]            
Line of credit aggregate borrowing capacity           $ 1,500,000
Heritage Global LLC [Member]            
Debt Instrument [Line Items]            
Litigation settlement, amount paid behalf of subsidiary     $ 1,260,000      
Number of installments | Installment     36      
Litigation settlement installments amount due     $ 35,000      
Remaining outstanding debt balance payable date     Jan. 30, 2021      
Interest rate on promissory note         6.50%  
Percentage of default interest amount       12.00%    
Debt instrument, periodic payment       $ 105,000    
Outstanding note balance       $ 724,000