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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