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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
OPERATING ACTIVITIES    
Net income $ 3,805 $ 1,895
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 392 480
Stock-based compensation expense 755 718
Excess tax benefits for share-based payments (139) (77)
Deferred income tax provision (benefit) 134 (156)
(Increase) decrease in assets:    
Accounts receivable (957) (1,752)
Inventories (4,119) 848
Prepaid expenses and other current assets 98 113
Income taxes receivable    541
Other non-current assets 606 (19)
Increase (decrease) in liabilities:    
Accounts payable 2,914 1,487
Income taxes payable (7) 33
Accrued expenses and other liabilities 2,774 (59)
Other long-term liabilities (461) 390
Net cash provided by operating activities 5,795 4,442
INVESTING ACTIVITIES    
Capital expenditures (185) (53)
Purchases of marketable securities (20,690) (17,167)
Sales of marketable securities 18,239 964
Maturities of marketable securities 925 6,045
Net cash used for investing activities (1,711) (10,211)
FINANCING ACTIVITIES    
Payment of dividends (1,510)   
Excess tax benefits for share-based payments 139 77
Cash paid for common stock purchased and retired (756) (447)
Proceeds received upon exercise of stock options 97 54
Net cash used for financing activities (2,030) (316)
Net increase (decrease) in cash and cash equivalents 2,054 (6,085)
Cash and cash equivalents at beginning of period 956 9,535
Cash and cash equivalents at end of period 3,010 3,450
Supplemental information:    
Income tax payments, net $ 1,376 $ 32