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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net income $ 28,488 $ 19,300 $ 16,745
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation expense 1,820 1,526 1,382
Gain on sale of equipment and property   (8) (103)
Amortization of premium related to marketable securities 213 425 1,152
Stock-based compensation expense 2,089 2,682 2,624
Excess tax benefits for share-based payments     (160)
Deferred income tax provision (benefit) 378 1,519 (862)
(Increase) decrease in assets:      
Accounts receivable (821) (1,964) 169
Inventories (8,764) 4,482 (9,850)
Prepaid expenses and other current assets 301 (273) 296
Income taxes receivable 262 (685) 791
Other non-current assets (563) (912) 1,266
Increase (decrease) in liabilities:      
Accounts payable (689) 199 1,482
Other accrued expenses (505) 1,760 2,282
Other long-term liabilities 566 1,588 (1,377)
Net cash provided by operating activities 22,775 29,639 15,837
INVESTING ACTIVITIES      
Capital expenditures (2,154) (2,410) (1,940)
Proceeds from sale of assets   8 88
Sales and maturities of marketable securities 21,423 18,067 52,519
Purchases of marketable securities (16,209) (22,214) (28,092)
Net cash provided by (used for) investing activities 3,060 (6,549) 22,575
FINANCING ACTIVITIES      
Payment of dividends (17,252) (11,504) (9,202)
Cash paid for common stock purchased and retired (7,522) (6,521) (34,737)
Excess tax benefits for share-based payments     160
Net cash used for financing activities (24,774) (18,025) (43,779)
Net increase (decrease) in cash and cash equivalents 1,061 5,065 (5,367)
Cash and cash equivalents at beginning of year 7,684 2,619 7,986
Cash and cash equivalents at end of year $ 8,745 $ 7,684 $ 2,619