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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
OPERATING ACTIVITIES    
Net income $ 5,386 $ 5,915
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 545 582
Gain on sale of equipment and property (12)  
Stock-based compensation expense 1,273 1,135
Excess tax benefits for share-based payments (108) (147)
Deferred income tax benefit (271) (33)
(Increase) decrease in assets:    
Accounts receivable (2,178) (987)
Inventories 572 (3,489)
Prepaid expenses and other current assets 40 (92)
Income taxes receivable 394  
Other non-current assets (271) 511
Increase (decrease) in liabilities:    
Accounts payable 3,040 4,053
Income taxes payable 489 64
Accrued expenses and other liabilities 437 3,004
Other long-term liabilities 237 (302)
Net cash provided by operating activities 9,573 10,214
INVESTING ACTIVITIES    
Capital expenditures (244) (273)
Proceeds from sale of assets 12  
Purchases of marketable securities (12,355) (27,077)
Sales of marketable securities 11,111 24,558
Maturities of marketable securities   925
Net cash used for investing activities (1,476) (1,867)
FINANCING ACTIVITIES    
Payment of dividends (3,423) (2,264)
Excess tax benefits for share-based payments 108 147
Cash paid for common stock purchased and retired (576) (708)
Proceeds received upon exercise of stock options   97
Net cash used for financing activities (3,891) (2,728)
Net increase in cash and cash equivalents 4,206 5,619
Cash and cash equivalents at beginning of period 1,648 956
Cash and cash equivalents at end of period 5,854 6,575
Supplemental information:    
Income tax payments, net $ 1,165 $ 2,337