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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities      
Net income $ 18,306 $ 10,541 $ 5,725
Adjustments required to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 2,415 2,437 2,384
Impairment of intangible assets 0 0 1,657
Write-down of obsolete inventory 3,002 5,246 1,578
Changes in marketable securities (20) 621 244
Share-based compensation expense 3,577 2,862 2,711
Deferred taxes, net 1,178 48 (61)
Changes in assets and liabilities:      
Accounts receivable - trade 3,695 (9,472) 3,467
Accounts receivable - other 396 1,217 (1,362)
Change in liability for employees' severance benefits, net 149 138 153
Inventories (15,289) (33,526) (13,336)
Trade accounts payable (12,410) 15,031 (2,076)
Other accounts payable and accrued expenses (9,089) 5,936 3,872
Net cash provided by (used in) operating activities (4,090) 1,079 4,956
Cash flows from investing activities      
Proceeds from short term bank deposits, net 0 5,000 8,542
Purchase of property, plant and equipment (2,089) (2,586) (1,694)
Investment in intangible assets (2,603) (3,572) (1,487)
Proceeds from maturity of marketable securities 16,029 37,850 16,629
Purchases of marketable securities (3,998) (19,927) (6,558)
Other 934 0 0
Net cash provided by investing activities 8,273 16,765 15,432
Cash flows from financing activities      
Exercise of options 0 0 276
Purchase of treasury shares (3,428) (14,291) (16,798)
Proceeds from reissuance of treasury shares upon exercise of options 2,377 4,514 0
Net cash used in financing activities (1,051) (9,777) (16,522)
Effect of exchange rate changes on cash balances held (1,683) 542 341
Increase in cash and cash equivalents 1,449 8,609 4,207
Cash and cash equivalents at beginning of year 29,285 20,676 16,469
Cash and cash equivalents at end of year 30,734 29,285 20,676
Supplementary cash flow information Non-cash transactions:      
Recognition of right of use assets and lease liabilities 1,433 451 7,201
Investments in property, plant and equipment 37 59 347
Non-cash Transactions Including Investments and right of use assets and lease liabilities 1,470 510 7,548
Cash paid (received) during the year for:      
Income taxes $ (411) $ 2,371 $ 1,284