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Note 19 - Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Foreign currency translation adjustments, net of tax $ (10,967) $ (10,915)
Accumulated other comprehensive loss (24,842) (25,551)
Internal Revenue Service (IRS) [Member]    
Employee benefit related adjustments, net of tax (14,177) (14,748)
Mexican Tax Authority [Member]    
Employee benefit related adjustments, net of tax $ 302 $ 112