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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
OPERATING ACTIVITIES    
Net income $ 15,944 $ 13,023
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,119 1,022
Gain on sale of equipment and property (8) (94)
Amortization of premium related to marketable securities 316 947
Stock-based compensation expense 2,235 2,142
Excess tax benefits for share-based payments   (134)
Deferred income tax benefit (252) (352)
(Increase) decrease in assets:    
Accounts receivable (6,351) (4,784)
Inventories 1,046 (5,060)
Prepaid expenses and other current assets 357 385
Income taxes receivable (966) 300
Other non-current assets (431) 904
Increase (decrease) in liabilities:    
Accounts payable 3,115 5,098
Accrued expenses and other liabilities 1,386 1,229
Other long-term liabilities 911 (1,039)
Net cash provided by operating activities 18,421 13,587
INVESTING ACTIVITIES    
Capital expenditures (1,527) (1,475)
Proceeds from sale of assets 8 79
Purchases of marketable securities (18,502) (24,406)
Sales of marketable securities 13,010 5,482
Maturities of marketable securities 1,070 11,642
Net cash used for investing activities (5,941) (8,678)
FINANCING ACTIVITIES    
Payment of dividends (7,332) (6,900)
Excess tax benefits for share-based payments   134
Cash paid for common stock purchased and retired (3,715) (947)
Net cash used for financing activities (11,047) (7,713)
Net increase (decrease) in cash and cash equivalents 1,433 (2,804)
Cash and cash equivalents at beginning of period 2,619 7,986
Cash and cash equivalents at end of period 4,052 5,182
Supplemental information:    
Income tax payments, net $ 7,466 $ 4,873