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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
OPERATING ACTIVITIES    
Net income $ 16,599 $ 11,380
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 849 730
Gain on sale of equipment and property   (8)
Amortization of premium related to marketable securities 152 189
Stock-based compensation expense 1,044 1,361
Deferred income tax provision 253 73
(Increase) decrease in assets:    
Accounts receivable (5,471) (4,120)
Inventories (6,925) 1,267
Prepaid expenses and other current assets 603 194
Income taxes receivable 497 (1,250)
Other non-current assets (996) (304)
Increase in liabilities:    
Accounts payable 9,244 5,189
Accrued expenses and other liabilities 1,730 2,119
Other long-term liabilities 537 1,030
Net cash provided by operating activities 18,116 17,850
INVESTING ACTIVITIES    
Capital expenditures (721) (914)
Proceeds from sale of assets   8
Purchases of marketable securities (12,350) (17,264)
Sales of marketable securities 5,714 7,603
Maturities of marketable securities 1,188 1,070
Net cash used for investing activities (6,169) (9,497)
FINANCING ACTIVITIES    
Payment of dividends (6,920) (4,892)
Cash paid for common stock purchased and retired (3,206) (2,246)
Net cash used for financing activities (10,126) (7,138)
Net increase in cash and cash equivalents 1,821 1,215
Cash and cash equivalents at beginning of period 7,684 2,619
Cash and cash equivalents at end of period 9,505 3,834
Supplemental information:    
Income tax payments, net $ 2,709 $ 5,436