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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 |

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