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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities |  |  |
Net income | $ 10,541 | $ 5,725 | $ 10,236
Adjustments required to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 2,437 | 2,384 | 1,997
Impairment of intangible assets | 0 | 1,657 | 0
Write-down of obsolete inventory | 5,246 | 1,578 | 2,106
Discount on marketable securities, net | 621 | 244 | 144
Share-based compensation expense | 2,862 | 2,711 | 2,355
Deferred taxes, net | 48 | (61) | (699)
Changes in assets and liabilities: |  |  |
Accounts receivable - trade | (9,472) | 3,467 | (1,441)
Accounts receivable - other | 1,217 | (1,362) | 4,385
Accounts receivable - related parties | 0 | 0 | 364
Change in liability for employees' severance benefits, net | 138 | 153 | 175
Inventories | (33,526) | (13,336) | 3,529
Trade accounts payable | 15,031 | (2,076) | 769
Other accounts payable and accrued expenses | 5,936 | 3,872 | 2,824
Accounts payable - related parties | 0 | 0 | (18)
Net cash provided by operating activities | 1,079 | 4,956 | 26,726
Cash flows from investing activities |  |  |
Investment in short-term bank deposits, net | 5,000 | 8,542 | (13,542)
Purchase of property, plant and equipment | (2,586) | (1,694) | (1,441)
Investment in intangible assets | (3,572) | (1,487) | (1,018)
Proceeds from maturity of marketable securities | 37,850 | 16,629 | 1,997
Purchases of marketable securities | (19,927) | (6,558) | (15,604)
Net cash provided by (used in) investing activities | 16,765 | 15,432 | (29,608)
Cash flows from financing activities |  |  |
Exercise of options | 0 | 276 | 154
Purchase of treasury shares | (14,291) | (16,798) | (7,971)
Proceeds from reissuance of treasury shares upon exercise of options | 4,514 | 0 | 0
Net cash used in financing activities | (9,777) | (16,522) | (7,817)
Effect of exchange rate changes on cash balances held | 542 | 341 | 360
Increase (decrease) in cash and cash equivalents | 8,609 | 4,207 | (10,339)
Cash and cash equivalents at beginning of year | 20,676 | 16,469 | 26,808
Cash and cash equivalents at end of year | 29,285 | 20,676 | 16,469
Supplementary cash flow information Non-cash transactions: |  |  |
Investments in property, plant and equipment and ROU | 510 | 7,548 | 1,621
Supplementary cash flow information Cash paid during the year for: |  |  |
Income taxes | $ 2,371 | $ 1,284 | $ 1,103

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