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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
OPERATING ACTIVITIES      
Net income $ 14,306 $ 8,914 $ 7,528
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation expense 1,013 712 726
(Gain) loss on sale of equipment and property (12) 31 (15)
Amortization of premium related to marketable securities 1,059 1,210 1,057
Stock-based compensation expense 1,993 1,754 1,702
Excess tax benefits for share-based payments (256) (342) (136)
Deferred income tax provision (benefit) 1,309 (805) 78
(Increase) decrease in assets:      
Accounts receivable 1,113 (348) (227)
Inventories (3,819) 40 (700)
Prepaid expenses and other current assets (413) 133 (232)
Income taxes receivable (441) 911 (164)
Other non-current assets (139) 790 (184)
Increase (decrease) in liabilities:      
Accounts payable 104 (1,992) 1,323
Other accrued expenses 486 638 (5)
Other long-term liabilities (259) (990) 186
Net cash provided by operating activities 16,044 10,656 10,937
INVESTING ACTIVITIES      
Capital expenditures (3,878) (451) (521)
Proceeds from sale of assets 6 1,083 15
Investment in joint venture   (2,554)  
Sales and maturities of marketable securities 17,659 20,085 14,576
Purchases of marketable securities (16,276) (22,320) (15,396)
Net cash used for investing activities (2,489) (4,157) (1,326)
FINANCING ACTIVITIES      
Payment of dividends (7,638) (6,102) (5,705)
Cash paid for common stock purchased and retired (2,259) (1,781) (576)
Excess tax benefits for share-based payments 256 342 136
Net cash used for financing activities (9,641) (7,541) (6,145)
Net increase (decrease) in cash and cash equivalents 3,914 (1,042) 3,466
Cash and cash equivalents at beginning of year 4,072 5,114 1,648
Cash and cash equivalents at end of year $ 7,986 $ 4,072 $ 5,114