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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Other operating income:      
Net income from other sales $ 8,651 $ 3,604 $ 4,395
Net rents 5,089 4,909 4,325
Other 8,025 6,546 1,796
Recovery on allowance for doubtful receivables 1,239
Other income 23,004 15,059 10,516
Other operating expenses:      
Contributions to welfare projects and non-profits organizations 11,199 11,379 9,158
Loss on fixed assets and material supplies disposed / scrapped 118
Allowance for doubtful receivables 1,179 84
Other expense including discontinued operations 11,199 12,558 9,360
From discontinued operations (1)
Other expense $ 11,199 $ 12,558 $ 9,359