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Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property, plant and equipment, gross $ 285,560 $ 281,239
Less accumulated depreciation (170,134) (164,168)
Property, plant and equipment, net 115,426 117,071
Land [Member]    
Property, plant and equipment, gross 4,141 4,187
Building [Member]    
Property, plant and equipment, gross 106,366 106,437
Machinery and Equipment [Member]    
Property, plant and equipment, gross $ 175,053 $ 170,615