Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable (Details) - Accounts Receivable (USD $) In Thousands, unless otherwise specified	Apr. 04, 2015	Jan. 03, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ (1,165)	$ (1,011)
Accounts receivable, net	62,277	59,187
Billed Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, current	48,231	47,318
Unbilled Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, current	7,065	4,853
Work In Progress [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, current	$ 8,146	$ 8,027