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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
OPERATING ACTIVITIES    
Net income $ 1,449 $ 1,632
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 186 196
Stock-based compensation expense 415 376
Excess tax benefits for share-based payments (82) (130)
Deferred income tax provision 193 341
(Increase) decrease in assets:    
Accounts receivable (1,344) (1,103)
Inventories 1,642 (882)
Prepaid expenses and other current assets 555 261
Income taxes receivable (572) (368)
Other non-current assets (152) 530
Increase (decrease) in liabilities:    
Accounts payable 2,948 3,120
Income taxes payable 104 (202)
Accrued expenses and other liabilities 1,189 2,451
Other long-term liabilities 187 (394)
Net cash provided by operating activities 6,718 5,828
INVESTING ACTIVITIES    
Capital expenditures (72) (82)
Purchases of marketable securities (2,955) (5,513)
Sales of marketable securities 2,599 5,872
Maturities of marketable securities   700
Net cash (used for) provided by investing activities (428) 977
FINANCING ACTIVITIES    
Payment of dividends (1,141) (755)
Excess tax benefits for share-based payments 82 130
Cash paid for common stock purchased and retired (534) (451)
Proceeds received upon exercise of stock options   97
Net cash used for financing activities (1,593) (979)
Net increase in cash and cash equivalents 4,697 5,826
Cash and cash equivalents at beginning of period 1,648 956
Cash and cash equivalents at end of period 6,345 6,782
Supplemental information:    
Income tax payments, net $ 451 $ 898