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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
OPERATING ACTIVITIES    
Net income $ 11,380 $ 8,739
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 730 671
Gain on sale of equipment and property (8) (79)
Amortization of premium related to marketable securities 189 609
Stock-based compensation expense 1,361 1,655
Excess tax benefits for share-based payments   (109)
Deferred income tax provision 73 608
(Increase) decrease in assets:    
Accounts receivable (4,120) (3,561)
Inventories 1,267 (1,954)
Prepaid expenses and other current assets 194 328
Income taxes receivable (1,250) 820
Other non-current assets (304) (514)
Increase (decrease) in liabilities:    
Accounts payable 5,189 2,375
Accrued expenses and other liabilities 2,119 2,438
Other long-term liabilities 1,030 (1,248)
Net cash provided by operating activities 17,850 10,778
INVESTING ACTIVITIES    
Capital expenditures (914) (663)
Proceeds from sale of assets 8 79
Purchases of marketable securities (17,264) (17,997)
Sales of marketable securities 7,603 2,464
Maturities of marketable securities 1,070 2,901
Net cash used for investing activities (9,497) (13,216)
FINANCING ACTIVITIES    
Payment of dividends (4,892) (4,593)
Excess tax benefits for share-based payments   109
Cash paid for common stock purchased and retired (2,246) (768)
Net cash used for financing activities (7,138) (5,252)
Net increase (decrease) in cash and cash equivalents 1,215 (7,690)
Cash and cash equivalents at beginning of period 2,619 7,986
Cash and cash equivalents at end of period 3,834 296
Supplemental information:    
Income tax payments, net $ 5,436 $ 1,772