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Note 6 - Other operating income and expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other operating income:      
Net income from other sales $ 9,891 $ 8,651 $ 3,604
Net rents 5,501 5,089 4,909
Other 18,001 8,025 6,546
Recovery on allowance for doubtful receivables 1,239
Other income 33,393 23,004 15,059
Other operating expenses:      
Contributions to welfare projects and non-profits organizations 12,989 11,199 11,379
Allowance for doubtful receivables 1,263 1,179
Other expense $ 14,252 $ 11,199 $ 12,558