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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
OPERATING ACTIVITIES    
Net income $ 6,873 $ 5,386
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 536 545
Gain on sale of equipment and property (17) (12)
Stock-based compensation expense 1,372 1,273
Excess tax benefits for share-based payments (311) (108)
Deferred income tax benefit (462) (271)
(Increase) decrease in assets:    
Accounts receivable (1,494) (2,178)
Inventories 4,286 572
Prepaid expenses and other current assets 195 40
Income taxes receivable 360 394
Other non-current assets (339) (271)
Increase (decrease) in liabilities:    
Accounts payable 369 3,040
Income taxes payable 426 489
Accrued expenses and other liabilities 1,261 437
Other long-term liabilities 93 237
Net cash provided by operating activities 13,148 9,573
INVESTING ACTIVITIES    
Capital expenditures (345) (244)
Proceeds from sale of assets 39 12
Purchases of marketable securities (15,324) (12,355)
Sales of marketable securities 4,719 11,111
Maturities of marketable securities 2,690  
Net cash used for investing activities (8,221) (1,476)
FINANCING ACTIVITIES    
Payment of dividends (3,435) (3,423)
Excess tax benefits for share-based payments 311 108
Cash paid for common stock purchased and retired (1,621) (576)
Net cash used for financing activities (4,745) (3,891)
Net increase in cash and cash equivalents 182 4,206
Cash and cash equivalents at beginning of period 5,114 1,648
Cash and cash equivalents at end of period 5,296 5,854
Supplemental information:    
Income tax payments, net $ 2,632 $ 1,165