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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
OPERATING ACTIVITIES    
Net income $ 5,915 $ 3,095
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 582 696
Stock-based compensation expense 1,135 1,090
Excess tax benefits for share-based payments (147) (77)
Deferred income tax benefit (33) (16)
(Increase) decrease in assets:    
Accounts receivable (987) (912)
Inventories (3,489) (1,258)
Prepaid expenses and other current assets (92) 128
Income taxes receivable   558
Other non-current assets 511 154
Increase (decrease) in liabilities:    
Accounts payable 4,053 2,735
Income taxes payable 64 397
Accrued expenses and other liabilities 3,004 186
Other long-term liabilities (302) (188)
Net cash provided by operating activities 10,214 6,588
INVESTING ACTIVITIES    
Capital expenditures (273) (142)
Purchases of marketable securities (27,077) (24,773)
Sales of marketable securities 24,558 5,801
Maturities of marketable securities 925 8,760
Net cash used for investing activities (1,867) (10,354)
FINANCING ACTIVITIES    
Payment of dividends (2,264)  
Excess tax benefits for share-based payments 147 77
Cash paid for common stock purchased and retired (708) (447)
Proceeds received upon exercise of stock options 97 54
Net cash used for financing activities (2,728) (316)
Net increase (decrease) in cash and cash equivalents 5,619 (4,082)
Cash and cash equivalents at beginning of period 956 9,535
Cash and cash equivalents at end of period 6,575 5,453
Supplemental information:    
Income tax payments, net $ 2,337 $ 47