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Note 7 - Property, Plant, and Equipment - Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Property, plant, and equipment $ 111,779 $ 107,743 $ 106,716
Land and Land Improvements [Member]      
Property, plant, and equipment 3,191   3,191
Building and Building Improvements [Member]      
Property, plant, and equipment 35,187   28,939
Leasehold Improvements [Member]      
Property, plant, and equipment 2,843   2,553
Machinery and Equipment [Member]      
Property, plant, and equipment 62,441   58,602
Furniture, Fixtures, and Computers [Member]      
Property, plant, and equipment 7,119   6,820
Construction in Progress [Member]      
Property, plant, and equipment $ 999   $ 6,611