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Note 5 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Impairment, Long-Lived Asset, Held-for-Use, Total $ 0       $ 0 $ 15,600
Proceeds from Sale of Property, Plant, and Equipment, Total         $ 4,300 $ 7,037
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 $ 5,000   $ 2,600