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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |  |
Net income |  | $ 11,009 | $ 10,061 | $ 4,966
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation and amortization |  | 4,871 | 4,422 | 4,865
Amortization of marketable securities premium |  | 158 | 173 | 94
Impairment charge on equity investee |  |  | 313 |
Stock-based compensation |  | 1,925 | 1,405 | 1,096
Provision for doubtful accounts |  |  |  | 313
Realized gain on sale of available-for-sale securities |  |  | (77) | (429)
Loss (gain) on disposal of equipment |  | (99) | 57 | 5
Loss from equity method investments, net |  | 1,080 | 1,381 | 1,995
Changes in operating assets and liabilities: |  |  |  |
Accounts receivable |  | 2,819 | (7,977) | 3,465
Inventories |  | (14,629) | (4,740) | (2,959)
Prepaid expenses and other current assets |  | (4,600) | (2,309) | (1,223)
Other assets |  | (1,888) | (52) | 458
Accounts payable |  | 2,314 | 4,401 | 524
Accrued liabilities | [1] | 518 | 1,642 | 205
Other long-term liabilities, including royalties |  | (260) | (85) | (871)
Net cash provided by operating activities |  | 3,218 | 8,615 | 12,504
Cash flows from investing activities: |  |  |  |
Purchases of property, plant and equipment |  | (40,539) | (21,356) | (2,728)
Proceeds from sale of equipment |  | 99 |  | 35
Purchases of available-for-sale securities |  | (9,937) | (30,021) | (11,936)
Proceeds from sales and maturities of available-for-sale securities |  | 19,550 | 14,750 | 13,516
Repayment of related party notes receivable |  |  | 169 |
Net cash used in investing activities |  | (30,827) | (36,458) | (1,113)
Cash flows from financing activities: |  |  |  |
Proceeds from issuance of common stock and options exercised, net of issuance costs |  | 628 | 34,338 | 1,337
Proceeds from sale of subsidiary shares to noncontrolling interests, net of portion allocated to noncontrolling interests |  |  | 1,765 |
Considerations paid in cash to repurchase subsidiary shares from noncontrolling interests |  | (415) |  |
Dividends paid by joint ventures to their minority shareholders |  |  | (465) | (39)
Net cash provided by financing activities |  | 213 | 35,638 | 1,298
Effect of exchange rate changes on cash and cash equivalents |  | (430) | 405 | (1,412)
Net (decrease) increase in cash and cash equivalents |  | (27,826) | 8,200 | 11,277
Cash and cash equivalents at the beginning of the year |  | 44,352 | 36,152 | 24,875
Cash and cash equivalents at the end of the year |  | 16,526 | 44,352 | 36,152
Supplemental disclosures: |  |  |  |
Income taxes paid, net of refunds |  | 1,134 | $ 714 | $ 788
Supplemental disclosure of non-cash flow information: |  |  |  |
Consideration payable to repurchase subsidiary shares from noncontrolling interests, included in accrued liabilities |  | 1,192 |  |
Reduction of noncontrolling interests in excess of total consideration paid and payable in connection with the repurchase of subsidiaries shares from noncontrolling interests |  | 187 |  |
Consideration payable in connection with constructions, included in accrued liabilities |  | $ 2,912 |  |
[1] | * Dividend accrued but not paid by joint ventures of $504, $533 and $499 was included in accrued liabilities as of December 31, 2018, 2017 and 2016, respectively.

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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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