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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Cash and Cash Equivalents, at Carrying Value   $ 2,851 $ 279 $ 985
Liabilities, Net   $ 1,700 2,500  
Number of Reporting Units   3    
Goodwill, Impairment Loss   $ 3,478 0  
Goodwill   11,685 12,325 11,630
Capitalized Computer Software, Additions   594 434  
Capitalized Computer Software, Net   1,841 2,018  
Deferred Tax Assets, Valuation Allowance   $ 0 $ 0  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   34.00% 34.00%  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 1,000    
Gross Billings   38,900 $ 49,700  
Construction Revenue   26,100 27,300  
Sales Revenue, Services, Other   2,600 3,600  
Advertising Expense   700 643  
New York Power Authority [Member]        
Accounts Receivable, Gross, Current     8,400  
Transit Accounts Payable [Member]        
Accounts Payable, Current   $ 4,700 $ 6,800  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Sikorsky Aircraft [Member]        
Concentration Risk, Percentage   10.40%    
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Five Largest Customers [Member]        
Concentration Risk, Percentage   37.90% 31.80%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Ten Largest Customers [Member]        
Concentration Risk, Percentage   51.40% 47.70%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Twenty Largest Customers [Member]        
Concentration Risk, Percentage   65.20% 60.80%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | New York City Board of Education [Member]        
Concentration Risk, Percentage   14.90%    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | New York Power Authority [Member]        
Concentration Risk, Percentage   11.90% 17.60%  
Total Accounts Receivable and Transit Accounts Receivable [Member] | Customer Concentration Risk [Member] | New York Power Authority [Member]        
Concentration Risk, Percentage   14.00% 17.00%  
Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%      
Information Technology [Member]        
Goodwill, Impairment Loss   $ 3,478    
Goodwill   2,038 $ 5,516 5,516
Engineering [Member]        
Goodwill, Impairment Loss      
Goodwill   $ 7,249 $ 4,411 $ 4,411
Engineering [Member] | Total Revenue From Agreements [Member]        
Concentration Risk, Percentage   14.00% 15.50%  
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    
Computers and Systems [Member]        
Property, Plant and Equipment, Useful Life   5 years    
Transit Accounts Receivable [Member]        
Accounts Receivable, Gross, Current   $ 3,000 $ 4,300  
Transit Accounts Receivable [Member] | New York Power Authority [Member]        
Accounts Receivable, Gross, Current     500  
Transit Accounts Payable [Member]        
Accounts Payable, Current   4,700 6,800  
CANADA        
Cash and Cash Equivalents, at Carrying Value   $ 100 $ 100