Annual report pursuant to Section 13 and 15(d)

10. Shareholders' Equity (Details Narrative)

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10. Shareholders' Equity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Stock issued for exercise of options, shares 0 12,000  
Options outstanding 710,000 780,000 905,000
Weighted average fair value per option granted $ .88 $ 1.12  
Share based compensation expense $ 245 $ 316  
Aggregate intrinsic value per share outstanding $ 1.12    
Warrants outstanding 24,000    
Warrant exercise price $ 3.55    
Warrant expiration date   May 31, 2020  
Options Exercised [Member]      
Stock issued for exercise of options, shares   13,000  
Proceeds from option exercises   $ 24  
Intrinsic value of options exercised   $ 10  
Energy Efficiency Investments [Member]      
Warrants issued 167,000    
Fair value of warrants issued $ 106    
2011 Plan [Member]      
Options authorized for issuance 700,000    
Options outstanding 485,000    
2011 Plan [Member] | Convertible Note Agreement [Member]      
Stock issued for convertible note agreement, shares 620,000    
2011 Plan [Member] | CEO [Member]      
Stock issued for compensation, shares 50,000    
Stock issued for compensation, value $ 62    
2011 Plan [Member] | Contractor [Member]      
Stock issued for services, shares 85,000    
2011 Plan [Member] | Then CEO [Member]      
Stock issued for compensation, shares   100,000  
Stock issued for compensation, value   $ 114  
2016 Plan [Member]      
Options authorized for issuance 2,000,000    
Options outstanding 20,000