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Note 4 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Property, plant and equipment, gross $ 278,351 $ 274,208
Less accumulated depreciation (158,910) (152,141)
Property, plant and equipment, net 119,441 122,067
Land [Member]    
Property, plant and equipment, gross 4,157 4,099
Building [Member]    
Property, plant and equipment, gross 105,733 104,952
Machinery and Equipment [Member]    
Property, plant and equipment, gross $ 168,461 $ 165,157