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Note 4 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Property, plant and equipment, gross $ 301,208 $ 277,467
Less accumulated depreciation 156,638 144,307
Property, plant and equipment - net 144,570 133,160
Land, Buildings and Leasehold Improvements [Member]    
Property, plant and equipment, gross 83,459 78,048
Machinery, Equipment and Other [Member]    
Property, plant and equipment, gross $ 217,749 $ 199,419