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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
OPERATING ACTIVITIES    
Net income $ 1,895 $ 2,385
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 480 567
Stock-based compensation expense 718 855
Excess tax benefits for share-based payment (77)  
Deferred income tax benefit (156) (886)
(Increase) decrease in assets:    
Accounts receivable (1,752) (1,180)
Inventories 848 (6,471)
Prepaid expenses and other current assets 113 1,587
Income taxes receivable 541 6,376
Other non-current assets (19) 117
Increase (decrease) in liabilities:    
Accounts payable 1,487 3,177
Income taxes payable 33 432
Accrued expenses and other liabilities 390 1,739
Other long-term liabilities (59) (292)
Net cash provided by operating activities 4,442 8,406
INVESTING ACTIVITIES    
Capital expenditures (53) (68)
Purchases of marketable securities (17,167) (14,488)
Sales of marketable securities 964 4,416
Maturities of marketable securities 6,045 8,360
Net cash used for investing activities (10,211) (1,780)
FINANCING ACTIVITIES    
Excess tax benefit for share-based payments 77  
Cash paid for common stock purchased and retired (447) (244)
Proceeds received upon exercise of stock options 54 6
Net cash used for financing activities (316) (238)
Net (decrease) increase in cash and cash equivalents (6,085) 6,388
Cash and cash equivalents at beginning of period 9,535 2,573
Cash and cash equivalents at end of period 3,450 8,961
Supplemental information:    
Income tax payments (refunds), net $ 32 $ (5,588)