Note 5 - Property, Plant and Equipment (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Land [Member]
Property, plant and equipment, gross	$ 4,485,000	$ 4,485,000
Buildings Improvements and Leaseholds [Member]
Property, plant and equipment, gross	16,601,000	11,329,000
Machinery, Equipment and Fixtures [Member]
Property, plant and equipment, gross	43,791,000	42,686,000
Property, plant and equipment, gross	64,877,000	58,500,000
Accumulated depreciation and amortization	(42,353,000)	(42,215,000)
	$ 22,524,000	$ 16,285,000