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Condensed Interim Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities    
Net income $ 5,918 $ 997
Adjustments required to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,028 1,447
Write-down of obsolete inventory 2,138 4,785
Discount on marketable securities, net 70 40
Share-based compensation expense 1,218 1,069
Deferred taxes, net (825) (71)
Changes in assets and liabilities:    
Accounts receivable - trade 1,854 13,808
Accounts receivable - other 1,837 624
Change in liability for Employees' severance benefits, net 145 (47)
Inventories 5,811 (2,938)
Trade accounts payable (4,181) 4,020
Other accounts payable and accrued expenses 641 (1,175)
Net cash provided by operating activities 15,654 22,559
Cash flows from investing activities    
Investment in short-term bank deposits, net (13,507)
Purchase of property, plant and equipment (734) (606)
Investment in intangible assets (504)
Proceeds from maturity of marketable securities 397 7,750
Purchases of marketable securities (12,754) (14,070)
Net cash used in investing activities (27,102) (6,926)
Cash flows from financing activities    
Exercise of options 59 77
Purchase of treasury shares (1,153)
Net cash provided by (used in) financing activities (1,094) 77
Effect of exchange rate changes on cash balances held 201 (55)
Increase (decrease) in cash and cash equivalents (12,341) 15,655
Cash and cash equivalents at beginning of period 26,808 17,021
Cash and cash equivalents at end of period 14,467 32,676
Supplementary cash flow information A. Non-cash transactions:    
Investments in PPE 70 284
Supplementary cash flow information B. Cash paid during the period for:    
Income taxes $ 213 $ 1,298