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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
OPERATING ACTIVITIES    
Net income $ 3,384 $ 3,805
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 371 392
Gain on sale of equipment and property (12)  
Stock-based compensation expense 844 755
Excess tax benefits for share-based payments (95) (139)
Deferred income tax (benefit) provision (41) 134
(Increase) decrease in assets:    
Accounts receivable (2,595) (957)
Inventories (1,151) (4,119)
Prepaid expenses and other current assets 99 98
Income taxes receivable 15  
Other non-current assets (105) 606
Increase (decrease) in liabilities:    
Accounts payable 4,401 2,914
Income taxes payable 161 (7)
Accrued expenses and other liabilities 217 2,774
Other long-term liabilities 32 (461)
Net cash provided by operating activities 5,525 5,795
INVESTING ACTIVITIES    
Capital expenditures (189) (185)
Proceeds from sale of assets 12  
Purchases of marketable securities (7,889) (20,690)
Sales of marketable securities 8,284 18,239
Maturities of marketable securities   925
Net cash provided by (used for) investing activities 218 (1,711)
FINANCING ACTIVITIES    
Payment of dividends (2,283) (1,510)
Excess tax benefits for share-based payments 95 139
Cash paid for common stock purchased and retired (576) (756)
Proceeds received upon exercise of stock options   97
Net cash used for financing activities (2,764) (2,030)
Net increase in cash and cash equivalents 2,979 2,054
Cash and cash equivalents at beginning of period 1,648 956
Cash and cash equivalents at end of period 4,627 3,010
Supplemental information:    
Income tax payments, net $ 767 $ 1,376