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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

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