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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
OPERATING ACTIVITIES    
Net income $ 4,991 $ 3,384
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 359 371
Gain on sale of equipment and property (17) (12)
Stock-based compensation expense 904 844
Excess tax benefits for share-based payments (298) (95)
Deferred income tax benefit (170) (41)
(Increase) decrease in assets:    
Accounts receivable (2,350) (2,595)
Inventories 3,682 (1,151)
Prepaid expenses and other current assets 229 99
Income taxes receivable 692 15
Other non-current assets (352) (105)
Increase (decrease) in liabilities:    
Accounts payable (1,093) 4,401
Income taxes payable 528 161
Accrued expenses and other liabilities 63 217
Other long-term liabilities 1,783 32
Net cash provided by operating activities 8,951 5,525
INVESTING ACTIVITIES    
Capital expenditures (258) (189)
Proceeds from sale of assets 39 12
Purchases of marketable securities (11,938) (7,889)
Sales of marketable securities 2,559 8,284
Maturities of marketable securities 1,600  
Net cash (used for) provided by investing activities (7,998) 218
FINANCING ACTIVITIES    
Payment of dividends (2,291) (2,283)
Excess tax benefits for share-based payments 298 95
Cash paid for common stock purchased and retired (1,621) (576)
Net cash used for financing activities (3,614) (2,764)
Net (decrease) increase in cash and cash equivalents (2,661) 2,979
Cash and cash equivalents at beginning of period 5,114 1,648
Cash and cash equivalents at end of period 2,453 4,627
Supplemental information:    
Income tax payments, net $ 1,096 $ 767