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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Cash and Cash Equivalents, at Carrying Value $ 279 $ 985 $ 6,411
Capitalized Computer Software, Additions 434 2,249  
Capitalized Computer Software, Net 2,018 2,386  
Gross Billings 49,700 65,900  
Construction Revenue 27,300 34,500  
Liabitilities, Net 2,500 1,500  
Sales Revenue, Services, Other 3,600 3,400  
Advertising Expense 643 635  
Goodwill, Impairment Loss 0 0  
Deferred Tax Assets, Valuation Allowance 0 0  
New York Power Authority [Member]      
Accounts Receivable, Gross, Current 8,400 9,800  
Ontario Power Group [Member]      
Accounts Receivable, Gross, Current   9,500  
Transit Accounts Payable [Member]      
Accounts Payable, Current 6,800 9,000  
Transit Accounts Receivable [Member]      
Accounts Receivable, Gross, Current 4,300 7,500  
Transit Accounts Receivable [Member] | New York Power Authority [Member]      
Accounts Receivable, Gross, Current $ 500 1,000  
Transit Accounts Receivable [Member] | Ontario Power Group [Member]      
Accounts Receivable, Gross, Current   $ 1,100  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | New York Power Authority [Member]      
Concentration Risk, Percentage 17.60% 17.40%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Ontario Power Group [Member]      
Concentration Risk, Percentage   16.50%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | New York City Board of Education [Member]      
Concentration Risk, Percentage   10.30%  
Total Accounts Receivable and Transit Accounts Receivable [Member] | Customer Concentration Risk [Member] | New York Power Authority [Member]      
Concentration Risk, Percentage 17.00% 16.80%  
Total Accounts Receivable and Transit Accounts Receivable [Member] | Customer Concentration Risk [Member] | Ontario Power Group [Member]      
Concentration Risk, Percentage   15.50%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Five Largest Customers [Member]      
Concentration Risk, Percentage 31.80% 33.70%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Ten Largest Customers [Member]      
Concentration Risk, Percentage 47.70% 48.30%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Twenty Largest Customers [Member]      
Concentration Risk, Percentage 60.80% 60.50%  
Engineering [Member] | Total Revenue From Agreements [Member]      
Concentration Risk, Percentage 15.50% 18.60%  
Restricted Covenants [Member]      
Finite-Lived Intangible Asset, Useful Life 4 years    
Customer Relationships [Member]      
Finite-Lived Intangible Asset, Useful Life 6 years    
Furniture and Fixtures [Member]      
Property, Plant and Equipment, Useful Life 5 years    
CANADA      
Cash and Cash Equivalents, at Carrying Value $ 100 $ 100