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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES      
Net income $ 19,300 $ 16,745 $ 14,306
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation expense 1,526 1,382 1,013
Gain on sale of equipment and property (8) (103) (12)
Amortization of premium related to marketable securities 425 1,152 1,059
Stock-based compensation expense 2,682 2,624 1,993
Excess tax benefits for share-based payments   (160) (256)
Deferred income tax provision (benefit) 1,519 (862) 1,309
(Increase) decrease in assets:      
Accounts receivable (1,964) 169 1,113
Inventories 4,482 (9,850) (3,819)
Prepaid expenses and other current assets (273) 296 (413)
Income taxes receivable (685) 791 (441)
Other non-current assets (912) 1,266 (139)
Increase (decrease) in liabilities:      
Accounts payable 199 1,482 104
Other accrued expenses 1,760 2,282 486
Other long-term liabilities 1,588 (1,377) (259)
Net cash provided by operating activities 29,639 15,837 16,044
INVESTING ACTIVITIES      
Capital expenditures (2,410) (1,940) (3,878)
Proceeds from sale of assets 8 88 6
Sales and maturities of marketable securities 18,067 52,519 17,659
Purchases of marketable securities (22,214) (28,092) (16,276)
Net cash (used for) provided by investing activities (6,549) 22,575 (2,489)
FINANCING ACTIVITIES      
Payment of dividends (11,504) (9,202) (7,638)
Cash paid for common stock purchased and retired (6,521) (34,737) (2,259)
Excess tax benefits for share-based payments   160 256
Net cash used for financing activities (18,025) (43,779) (9,641)
Net increase (decrease) in cash and cash equivalents 5,065 (5,367) 3,914
Cash and cash equivalents at beginning of year 2,619 7,986 4,072
Cash and cash equivalents at end of year $ 7,684 $ 2,619 $ 7,986