Note 6 - Property, Plant and Equipment (Detail) - Property, Plant and Equipment (USD $)	Mar. 31, 2013	Dec. 31, 2012
Leased assets	$ 1,593,000
Building and improvements	4,324,000	4,324,000
Furniture, office equipment & other	2,016,000	1,930,000
	14,531,000	12,897,000
Total property, plant and equipment	5,553,000	4,076,000
Held and Used [Member]
Machinery and equipment	6,598,000	6,643,000
Less accumulated depreciation	(8,978,000)	(8,821,000)
Total property, plant and equipment	5,553,000	4,076,000
Held and Not Used [Member]
Machinery and equipment	4,249,000	4,249,000
Less accumulated depreciation	(2,438,000)	(2,392,000)
Total property, plant and equipment	$ 1,811,000	$ 1,857,000