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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Apr. 02, 2011
Cash flows from operating activities:    
Net income $ 1,059 $ 1,175
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 278 308
Reduction of contingent consideration (43)  
Stock-based compensation expense 14 23
Provision for (reduction of) allowance for doubtful accounts 4 (103)
Deferred income tax expense 137  
Changes in assets and liabilities:    
Accounts receivable (681) (475)
Transit accounts receivable 1,869  
Prepaid expenses and other current assets (197) (277)
Accounts payable and accrued expenses (275) (86)
Transit accounts payable (942)  
Accrued payroll and related costs 1,429 973
Income taxes payable 601 370
Total adjustments 2,194 733
Net cash provided by operating activities 3,253 1,908
Cash flows from investing activities:    
Property and equipment acquired (73) (67)
Increase in deposits (74) (43)
Net cash used in investing activities (147) (110)
Cash flows from financing activities:    
Sale of stock for employee stock purchase plan 61 84
Exercise of stock options 207 23
Common stock repurchases (293) (655)
Net cash used in financing activities (25) (548)
Effect of exchange rate changes on cash and cash equivalents (20) (9)
Increase in cash and cash equivalents 3,061 1,241
Cash and cash equivalents at beginning of period 28,417 24,704
Cash and cash equivalents at end of period 31,478 25,945
Cash paid for:    
Interest 20 24
Income taxes $ 69 $ 521