Quarterly report pursuant to Section 13 or 15(d)

17. Short term debt (Details Narrative)

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17. Short term debt (Details Narrative) - USD ($)
$ in Thousands
9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Jan. 31, 2017
Debt and capital lease obligations $ 467   $ 5,577  
Debt maturity date Aug. 18, 2018      
Repayments of line of credit $ 0 $ 10,333    
Debt issuance costs 0 $ 484    
GE 8.00% notes [Member]        
Debt and capital lease obligations 482   482  
Energy Efficiency Investments [Member] | Term Loan [Member]        
Debt and capital lease obligations $ 0   103  
Debt issuance date Nov. 08, 2016      
Debt face amount     7,732  
Debt issuance costs $ 740      
Unamortized debt issuance costs 457   568  
AFCO Credit Corp [Member] | Term Loan [Member]        
Debt and capital lease obligations $ 442   367  
Debt issuance date Jun. 16, 2017      
Debt face amount     1,070  
Debt interest rate description 3.567%      
MidCap Financial Trust [Member] | Term Loan [Member]        
Debt and capital lease obligations $ 0   5,605  
Debt issuance date May 10, 2017      
Debt interest rate description one month LIBOR plus 4.50%      
Debt maturity date Aug. 18, 2018      
Maximum borrowing capacity     12,000  
Available borrowing capacity under the Credit Agreement     1,031  
Proceeds from line of credit $ 21,470      
Repayments of line of credit 27,075      
Debt issuance costs 546      
Unamortized debt issuance costs $ 395      
PNC Bank [Member] | Term Loan [Member]        
Debt and capital lease obligations     $ 0 $ 1,020