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Note 5 - Other Operating Income and Expenses - Components of Other Operating Income and Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other operating income: |  |  |
Net income from other sales | $ 4,395 | $ 16,275 | $ 7,480
Net rents | 4,325 | 4,852 | 6,462
Other | 1,796 |  | 661
| 10,516 | 21,127 | 14,603
Other operating expenses: |  |  |
Contributions to welfare projects and non-profits organizations | 9,158 | 9,534 | 9,052
Provisions for legal claims and contingencies |  | 10 | 1
Loss on fixed assets and material supplies disposed / scrapped | 118 | 57 | 94
Impairment charge |  |  | 400,314
Allowance for doubtful receivables | 84 | 432 | 1,114
Other |  | 1,378 |
| 9,360 | 11,411 | 410,575
From discontinued operations | (1) | (248) | (1)
| $ 9,359 | $ 11,163 | $ 410,574

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