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Note 6 - Property and Equipment - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property and equipment, gross $ 153,067 $ 151,148
Less accumulated depreciation and amortization (74,311) (69,477)
Property and equipment, net 78,756 81,671
Land Improvements [Member]    
Property and equipment, gross 20,185 19,787
Building [Member]    
Property and equipment, gross 30,301 30,219
Machinery and Equipment [Member]    
Property and equipment, gross 100,438 99,485
Assets Held under Capital Leases [Member]    
Property and equipment, gross 1,171 1,126
Construction in Progress [Member]    
Property and equipment, gross $ 972 $ 531