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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
OPERATING ACTIVITIES: |  |  |
Net income | $ 39,111 | $ 33,746 | $ 23,016
Adjustments to reconcile net income to net cash flows from operating activities: |  |  |
Depreciation and amortization | 9,127 | 7,745 | 6,147
(Gain) Loss on disposal of property, plant and equipment | (21) | 156 | (608)
Provision for doubtful accounts | 15 | 214 | 86
Issuance of non-employee director shares | 150 | 150 | 150
Deferred tax provision | 1,708 | 568 | (868)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (19,605) | (19,353) | (6,668)
Inventories | 5,453 | (23,865) | (2,844)
Prepaid expenses | (1,529) | 989 | 765
Other assets | 609 | 60 | 8
Accounts payable | (2,165) | 19,425 | (5,806)
Accrued liabilities | 2,279 | 2,062 | 575
Net cash flows from operating activities | 35,132 | 21,897 | 13,953
INVESTING ACTIVITIES: |  |  |
Purchases of property, plant and equipment | (17,391) | (13,342) | (24,693)
Proceeds from sale of property, plant and equipment | 328 | 141 | 1,303
Net cash flows from investing activities | (17,063) | (13,201) | (23,390)
FINANCING ACTIVITIES: |  |  |
Net proceeds (payments) under credit facility | (10,002) | 5,000 | 5,000
Payments of cash dividends | (8,208) | (8,200) | (8,188)
Net proceeds (payments) on other long-term obligations | (367) | 56 | 146
Finance lease obligation payments | (20) |  |
Proceeds from exercise of stock options |  | 179 | 606
Net cash flows from financing activities | (18,597) | (2,965) | (2,436)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND TEMPORARY INVESTMENTS | (437) | (589) | 2,653
NET CHANGE IN CASH AND TEMPORARY INVESTMENTS | (965) | 5,142 | (9,220)
CASH AND TEMPORARY INVESTMENTS, beginning of period | 27,037 | 21,895 | 31,115
CASH AND TEMPORARY INVESTMENTS, end of period | 26,072 | 27,037 | 21,895
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |
Cash payments for interest | 3,249 | 2,437 | 1,877
Cash payments for income taxes, net of refunds | $ 10,067 | $ 7,457 | $ 11,605

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