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Note 4 - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Land and Land Improvements [Member]    
Property and equipment, Gross $ 23,903 $ 23,689
Building [Member]    
Property and equipment, Gross 44,409 42,368
Machinery and Equipment [Member]    
Property and equipment, Gross 146,704 140,578
Assets Held under Capital Leases [Member]    
Property and equipment, Gross 924 6,001
Construction in Progress [Member]    
Property and equipment, Gross 2,359 4,183
Property and equipment, Gross 218,299 216,819
Less accumulated depreciation and amortization (86,451) (84,224)
Property and equipment, net $ 131,848 $ 132,595