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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
OPERATING ACTIVITIES    
Net income $ 1,632 $ 666
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 196 249
Stock-based compensation expense 376 346
Excess tax benefits for share-based payments (130) (77)
Deferred income tax provision 341 33
(Increase) decrease in assets:    
Accounts receivable (1,103) (1,633)
Inventories (882) 416
Prepaid expenses and other current assets 261 246
Income taxes receivable (368) 129
Other non-current assets 530 (49)
Increase (decrease) in liabilities:    
Accounts payable 3,120 2,867
Income taxes payable (202) 17
Accrued expenses and other liabilities 2,451 745
Other long-term liabilities (394) (98)
Net cash provided by operating activities 5,828 3,857
INVESTING ACTIVITIES    
Capital expenditures (82) (33)
Purchases of marketable securities (5,513) (10,419)
Sales of marketable securities 5,872  
Maturities of marketable securities 700 3,475
Net cash provided by (used for) investing activities 977 (6,977)
FINANCING ACTIVITIES    
Payment of dividends (755)  
Excess tax benefits for share-based payments 130 77
Cash paid for common stock purchased and retired (451) (447)
Proceeds received upon exercise of stock options 97 2
Net cash used for financing activities (979) (368)
Net increase (decrease) in cash and cash equivalents 5,826 (3,488)
Cash and cash equivalents at beginning of period 956 9,535
Cash and cash equivalents at end of period 6,782 6,047
Supplemental information:    
Income tax payments (refunds), net $ 898 $ 12