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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Other operating income:      
Net income from other sales $ 3,604 $ 4,395 $ 16,275
Net rents 4,909 4,325 4,852
Other 6,546 1,796
15,059 10,516 21,127
Other operating expenses:      
Contributions to welfare projects and non-profits organizations 11,379 9,158 9,534
Loss on fixed assets and material supplies disposed / scrapped 118 57
Allowance for doubtful receivables 1,179 84 432
Other 1,388
12,558 9,360 11,411
From discontinued operations (1) (248)
$ 12,558 $ 9,359 $ 11,163