Quarterly report pursuant to Section 13 or 15(d)

22. Shareholders' Equity (Details Narrative)

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22. Shareholders' Equity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 31, 2016
Dec. 30, 2017
Common Stock, issued shares (in shares) 6,875,000     6,875,000
Common Stock, outstanding shares (in shares) 6,875,000     6,875,000
Options outstanding 594,000     627,000
Expected dividend yield (as a percent) 0.00%      
Expected stock price volatility (as a percent) 85.44%      
Risk-free interest rate (as a percent) 2.16%      
Expected life of options (in years) 10 years      
Aggregate intrinsic value per share outstanding $ 0.83      
Warrants outstanding 24,000      
Warrant exercise price $ 3.55      
Warrant expiration date   May 31, 2020    
2016 Plan [Member]        
Options authorized for issuance 2,000,000      
Options outstanding 20,000      
2011 Plan [Member]        
Options outstanding 485,000      
Energy Efficiency Investments [Member]        
Warrants issued     167,000  
Fair value of warrants issued     $ 106