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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
OPERATING ACTIVITIES      
Net income $ 16,745 $ 14,306 $ 8,914
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation expense 1,382 1,013 712
(Gain) loss on sale of equipment and property (103) (12) 31
Amortization of premium related to marketable securities 1,152 1,059 1,210
Stock-based compensation expense 2,624 1,993 1,754
Excess tax benefits for share-based payments (160) (256) (342)
Deferred income tax (benefit) provision (862) 1,309 (805)
(Increase) decrease in assets:      
Accounts receivable 169 1,113 (348)
Inventories (9,850) (3,819) 40
Prepaid expenses and other current assets 296 (413) 133
Income taxes receivable 791 (441) 911
Other non-current assets 1,266 (139) 790
Increase (decrease) in liabilities:      
Accounts payable 1,482 104 (1,992)
Other accrued expenses 2,282 486 638
Other long-term liabilities (1,377) (259) (990)
Net cash provided by operating activities 15,837 16,044 10,656
INVESTING ACTIVITIES      
Capital expenditures (1,940) (3,878) (451)
Proceeds from sale of assets 88 6 1,083
Investment in joint venture     (2,554)
Sales and maturities of marketable securities 52,519 17,659 20,085
Purchases of marketable securities (28,092) (16,276) (22,320)
Net cash provided by (used for) investing activities 22,575 (2,489) (4,157)
FINANCING ACTIVITIES      
Payment of dividends (9,202) (7,638) (6,102)
Cash paid for common stock purchased and retired (34,737) (2,259) (1,781)
Excess tax benefits for share-based payments 160 256 342
Net cash used for financing activities (43,779) (9,641) (7,541)
Net (decrease) increase in cash and cash equivalents (5,367) 3,914 (1,042)
Cash and cash equivalents at beginning of year 7,986 4,072 5,114
Cash and cash equivalents at end of year $ 2,619 $ 7,986 $ 4,072