Note 6 - Property, Plant, and Equipment - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, plant, and equipment	$ 96,806	$ 90,564
Land and Land Improvements [Member]
Property, plant, and equipment	3,191	3,191
Building and Building Improvements [Member]
Property, plant, and equipment	28,241	25,399
Leasehold Improvements [Member]
Property, plant, and equipment	2,759	2,839
Machinery and Equipment [Member]
Property, plant, and equipment	54,633	51,016
Furniture, Fixtures, and Computers [Member]
Property, plant, and equipment	6,419	6,498
Construction in Progress [Member]
Property, plant, and equipment	$ 1,563	$ 1,621