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Note 5 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Impairment, Long-Lived Asset, Held-for-Use, Total $ 0     $ 0 $ 15,500
Proceeds from Sale of Property, Plant, and Equipment, Total       $ 4,209 $ 6,565
Building and Building Improvements [Member]          
Proceeds from Sale of Property, Plant, and Equipment, Total 1,800 $ 1,900 $ 5,400    
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ 1,300 200 $ 600    
Property, Plant and Equipment, Transfers and Changes   $ 2,600