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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
OPERATING ACTIVITIES    
Net income $ 23,760 $ 15,944
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,330 1,119
Gain on sale of equipment and property   (8)
Amortization of premium related to marketable securities 200 316
Stock-based compensation expense 1,572 2,235
Deferred income tax provision (benefit) 239 (252)
(Increase) decrease in assets:    
Accounts receivable (4,353) (6,351)
Inventories (11,865) 1,046
Prepaid expenses and other current assets 569 357
Income taxes receivable 643 (966)
Other non-current assets (1,227) (431)
Increase (decrease) in liabilities:    
Accounts payable 6,863 3,115
Accrued expenses and other liabilities (609) 1,386
Other long-term liabilities 1,063 911
Net cash provided by operating activities 18,185 18,421
INVESTING ACTIVITIES    
Capital expenditures (1,912) (1,527)
Proceeds from sale of assets   8
Purchases of marketable securities (15,075) (18,502)
Sales of marketable securities 9,799 13,010
Maturities of marketable securities 1,973 1,070
Net cash used for investing activities (5,215) (5,941)
FINANCING ACTIVITIES    
Payment of dividends (10,372) (7,332)
Cash paid for common stock purchased and retired (4,136) (3,715)
Net cash used for financing activities (14,508) (11,047)
Net (decrease) increase in cash and cash equivalents (1,538) 1,433
Cash and cash equivalents at beginning of period 7,684 [1] 2,619
Cash and cash equivalents at end of period 6,146 4,052
Supplemental information:    
Income tax payments, net $ 4,597 $ 7,466
[1] (Note 1)