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Note 18 - Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Foreign currency translation adjustments, net of tax $ (10,623) $ (10,967)
Accumulated other comprehensive loss (24,051) (24,842)
Internal Revenue Service (IRS) [Member]    
Employee benefit related adjustments, net of tax (13,544) (14,177)
Mexican Tax Authority [Member]    
Employee benefit related adjustments, net of tax $ 116 $ 302