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Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property, plant and equipment, gross $ 295,496 $ 288,477
Less accumulated depreciation (184,143) (174,984)
Property, plant and equipment, net 111,353 113,493
Land [Member]    
Property, plant and equipment, gross 4,936 3,869
Building [Member]    
Property, plant and equipment, gross 109,143 106,940
Machinery and Equipment [Member]    
Property, plant and equipment, gross $ 181,417 $ 177,668