Note 4 - Property (Details) - Property, Plant, and Equipment (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 75,401	$ 77,266
Less accumulated depreciation	39,335	37,084
Net Property	36,066	40,182
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	5,158	5,355
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	24,951	24,951
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	33,479	33,534
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	11,813	11,820
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross		$ 1,606