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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities      
Net income $ 5,725 $ 10,236 $ 14,637
Adjustments required to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 2,384 1,997 3,293
Impairment of intangible assets 1,657
Write-down of obsolete inventory 1,578 2,106 6,211
Discount on marketable securities, net 244 144 32
Share-based compensation expense 2,711 2,355 2,424
Deferred taxes, net (61) (699) 5
Changes in assets and liabilities:      
Accounts receivable - trade 3,467 (1,441) 16,985
Accounts receivable - other (1,362) 4,385 (3,384)
Accounts receivable - related parties 364 261
Change in liability for employees' severance benefits, net 153 175 (79)
Inventories (13,336) 3,529 2,540
Trade accounts payable (2,076) 769 3,059
Other accounts payable and accrued expenses 3,872 2,824 (314)
Accounts payable - related parties (18) 8
Net cash provided by operating activities 4,956 26,726 45,678
Cash flows from investing activities      
Investment in short-term bank deposits, net 8,542 (13,542)
Purchase of property, plant and equipment (1,694) (1,441) (1,345)
Investment in intangible assets (1,487) (1,018) (1,022)
Proceeds from maturity of marketable securities 16,629 1,997 7,750
Purchases of marketable securities (6,558) (15,604) (41,670)
Net cash provided by (used in) investing activities 15,432 (29,608) (36,287)
Cash flows from financing activities      
Exercise of options 276 154 288
Purchase of treasury shares (16,798) (7,971)
Net cash provided by (used in) financing activities (16,522) (7,817) 288
Effect of exchange rate changes on cash balances held 341 360 108
Increase (decrease) in cash and cash equivalents 4,207 (10,339) 9,787
Cash and cash equivalents at beginning of year 16,469 26,808 17,021
Cash and cash equivalents at end of year 20,676 16,469 26,808
Supplementary cash flow information Non-cash transactions:      
Investments in property, plant and equipment 347 97 146
Supplementary cash flow information Cash paid during the year for:      
Income taxes $ 1,284 $ 1,103 $ 3,260