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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
OPERATING ACTIVITIES    
Net income $ 13,023 $ 10,461
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,022 690
Gain on sale of equipment and property (94) (12)
Amortization of premium related to marketable securities 947 787
Stock-based compensation expense 2,142 1,481
Excess tax benefits for share-based payments (134) (221)
Deferred income tax (benefit) provision (352) 453
(Increase) decrease in assets:    
Accounts receivable (4,784) (1,592)
Inventories (5,060) (3,487)
Prepaid expenses and other current assets 385 (120)
Income taxes receivable 300 (590)
Other non-current assets 904 95
Increase (decrease) in liabilities:    
Accounts payable 5,098 5,506
Accrued expenses and other liabilities 1,229 576
Other long-term liabilities (1,039) (522)
Net cash provided by operating activities 13,587 13,505
INVESTING ACTIVITIES    
Capital expenditures (1,475) (3,604)
Proceeds from sale of assets 79 7
Purchases of marketable securities (24,406) (10,683)
Sales of marketable securities 5,482 11,389
Maturities of marketable securities 11,642 900
Net cash used for investing activities (8,678) (1,991)
FINANCING ACTIVITIES    
Payment of dividends (6,900) (4,588)
Excess tax benefits for share-based payments 134 221
Cash paid for common stock purchased and retired (947) (2,108)
Net cash used for financing activities (7,713) (6,475)
Net (decrease) increase in cash and cash equivalents (2,804) 5,039
Cash and cash equivalents at beginning of period 7,986 4,072
Cash and cash equivalents at end of period 5,182 9,111
Supplemental information:    
Income tax payments, net $ 4,873 $ 4,757