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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
OPERATING ACTIVITIES    
Net income $ 7,358 $ 4,991
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 375 359
Gain on sale of equipment and property (12) (17)
Stock-based compensation expense 984 904
Excess tax benefits for share-based payments (203) (298)
Deferred income tax provision (benefit) 420 (170)
(Increase) decrease in assets:    
Accounts receivable (2,213) (2,350)
Inventories (1,317) 3,682
Prepaid expenses and other current assets (158) 229
Income taxes receivable 123 692
Other non-current assets (116) (352)
Increase (decrease) in liabilities:    
Accounts payable 5,632 (1,093)
Income taxes payable 624 528
Accrued expenses and other liabilities 831 1,783
Other long-term liabilities (281) 63
Net cash provided by operating activities 12,047 8,951
INVESTING ACTIVITIES    
Capital expenditures (2,956) (258)
Proceeds from sale of assets 7 39
Purchases of marketable securities (7,427) (11,938)
Sales of marketable securities 8,174 2,559
Maturities of marketable securities 250 1,600
Net cash used for investing activities (1,952) (7,998)
FINANCING ACTIVITIES    
Payment of dividends (3,063) (2,291)
Excess tax benefits for share-based payments 203 298
Cash paid for common stock purchased and retired (1,995) (1,621)
Net cash used for financing activities (4,855) (3,614)
Net increase (decrease) in cash and cash equivalents 5,240 (2,661)
Cash and cash equivalents at beginning of period 4,072 5,114
Cash and cash equivalents at end of period 9,312 2,453
Supplemental information:    
Income tax payments, net $ 2,372 $ 1,096