Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Dec. 30, 2017	Dec. 28, 2019	Dec. 29, 2018
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 2,851	$ 1,847	$ 482
Accounts Receivable, after Allowance for Credit Loss, Current, Total		$ 59,760	52,335
Annual Depreciation Rate		20.00%
Number of Reporting Units		3
Goodwill, Impairment Loss		$ 0	0
Capitalized Computer Software, Additions		139	1,150
Capitalized Computer Software, Net, Ending Balance		1,726	2,255
Deferred Tax Assets, Valuation Allowance, Total		$ 0	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	21.00%	21.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			$ 1,000
Revenue from Contract with Customer, Including Assessed Tax		$ 191,100	200,352
Contract with Customer, Liability, Total		400	200
Contract with Customer, Liability, Revenue Recognized		200	600
Advertising Expense		$ 855	$ 671
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| New York City Board of Education [Member]
Concentration Risk, Percentage		17.60%	13.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Hawaii Department of Education [Member]
Concentration Risk, Percentage		11.10%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Five Largest Customers [Member]
Concentration Risk, Percentage		43.50%	40.90%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Ten Largest Customers [Member]
Concentration Risk, Percentage		57.00%	54.60%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Twenty Largest Customers [Member]
Concentration Risk, Percentage		69.20%	67.40%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| New York City Board of Education [Member]
Concentration Risk, Percentage		17.60%	16.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Hawaii Department of Education [Member]
Concentration Risk, Percentage		12.70%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| New York Power Authority [Member]
Concentration Risk, Percentage		24.60%	22.70%
Total Accounts Receivable and Transit Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| New York Power Authority [Member]
Concentration Risk, Percentage		27.30%	23.30%
Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 1,800	$ 1,800
Restricted Covenants [Member]
Finite-Lived Intangible Asset, Useful Life		4 years
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life		6 years
Transit Accounts Payable [Member]
Accounts Payable, Current, Total		$ 4,600	2,500
Transit Accounts Receivable [Member]
Accounts Receivable, before Allowance for Credit Loss, Current		4,900	2,600
Accounts Receivable, after Allowance for Credit Loss, Current, Total		300	100
CANADA
Cash and Cash Equivalents, at Carrying Value, Ending Balance		56	32
Revenue from Contract with Customer, Including Assessed Tax		16,822	27,869
SERBIA
Cash and Cash Equivalents, at Carrying Value, Ending Balance		129	61
Revenue from Contract with Customer, Including Assessed Tax		$ 2,586	$ 2,058

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