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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 $ 14,637 $ 21,714 $ 13,137
Adjustments required to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 3,293 3,799 3,856
Write-down of obsolete inventory 6,211 2,918 3,170
Discount on marketable securities, net 32 217 358
Share-based compensation expense 2,424 2,425 1,550
Deferred taxes, net 5 453 (260)
Changes in assets and liabilities:      
Accounts receivable - trade 16,985 (13,237) (4,007)
Accounts receivable - other (3,384) (2,475) (1,832)
Accounts receivable - related parties 261 (208) 56
Change in liability for employees' severance benefits, net (79) 171 126
Inventories 2,540 (10,287) (21,426)
Trade accounts payable 3,059 1,698 1,809
Other accounts payable and accrued expenses (314) (1,144) 1,098
Contingent consideration benefit (4,642) (334)
Accounts payable - related parties 8 6 (8)
Net cash provided by (used in) operating activities 45,678 1,408 (2,707)
Cash flows from investing activities      
Purchase of property, plant and equipment (1,345) (1,690) (1,441)
Investment in intangible assets (1,022) (11)
Proceeds from maturity of marketable securities 7,750 16,175 8,575
Purchases of marketable securities (41,670) (5,961)
Net cash provided by (used in) investing activities (36,287) 8,513 7,134
Cash flows from financing activities      
Exercise of options 288 2,651 952
Dividend (7,382) (7,312)
Payment made in connection with contingent consideration (4,463)
Net cash provided by (used in) financing activities 288 (4,731) (10,823)
Effect of exchange rate changes on cash balances held 108 (86) 135
Increase (decrease) in cash and cash equivalents 9,787 5,104 (6,261)
Cash and cash equivalents at beginning of year 17,021 11,917 18,178
Cash and cash equivalents at end of year 26,808 17,021 11,917
Supplementary cash flow information Non-cash transactions:      
Investments in PPE and intangible assets 146 119 39
Supplementary cash flow information Cash paid during the year for:      
Income taxes $ 3,260 $ 4,584 $ 4,648