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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
OPERATING ACTIVITIES    
Net income $ 1,978 $ 1,449
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 181 186
Gain on sale of equipment and property (12)  
Stock-based compensation expense 444 415
Excess tax benefits for share-based payments (284) (82)
Deferred income tax provision 223 193
(Increase) decrease in assets:    
Accounts receivable (979) (1,344)
Inventories 2,311 1,642
Prepaid expenses and other current assets 646 555
Income taxes receivable 276 (572)
Other non-current assets (213) (152)
Increase (decrease) in liabilities:    
Accounts payable 2,840 2,948
Income taxes payable 312 104
Accrued expenses and other liabilities 1,741 1,189
Other long-term liabilities (133) 187
Net cash provided by operating activities 9,331 6,718
INVESTING ACTIVITIES    
Capital expenditures (102) (72)
Proceeds from sale of assets 34  
Purchases of marketable securities (6,867) (2,955)
Sales of marketable securities 2,459 2,599
Maturities of marketable securities 400  
Net cash used for investing activities (4,076) (428)
FINANCING ACTIVITIES    
Payment of dividends (1,145) (1,141)
Excess tax benefits for share-based payments 284 82
Cash paid for common stock purchased and retired (845) (534)
Net cash used for financing activities (1,706) (1,593)
Net increase in cash and cash equivalents 3,549 4,697
Cash and cash equivalents at beginning of period 5,114 1,648
Cash and cash equivalents at end of period 8,663 6,345
Supplemental information:    
Income tax payments, net $ 100 $ 451