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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
OPERATING ACTIVITIES    
Net income $ 7,469 $ 7,609
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 505 417
(Accretion) of discount/amortization of premium related to marketable securities, net (5) 87
Stock-based compensation expense 538 516
Deferred income tax (benefit)/provision (109) 129
(Increase) decrease in assets:    
Accounts receivable (6,022) (4,761)
Inventories (1,054) (6,034)
Prepaid expenses and other current assets 668 784
Income taxes receivable   (406)
Other non-current assets (651) (2)
Increase (decrease) in liabilities:    
Accounts payable 7,744 7,636
Accrued expenses and other liabilities 1,956 1,562
Other long-term liabilities 1,005 (27)
Net cash provided by operating activities 12,044 7,510
INVESTING ACTIVITIES    
Capital expenditures (1,108) (309)
Purchases of marketable securities (299) (3,581)
Sales of marketable securities 7,530 4,675
Maturities of marketable securities 448 350
Net cash provided by investing activities 6,571 1,135
FINANCING ACTIVITIES    
Payment of dividends (4,117) (3,465)
Cash paid for common stock purchased and retired (4,896) (2,935)
Net cash used for financing activities (9,013) (6,400)
Net increase in cash and cash equivalents 9,602 2,245
Cash and cash equivalents at beginning of period 8,745 [1] 7,684
Cash and cash equivalents at end of period 18,347 9,929
Supplemental information:    
Income tax payments, net $ 1,446 $ 1,556
[1] Note 1