Note 5 - Property and Equipment (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Buildings	$ 355,000	$ 355,000
Machinery and equipment	10,515,000	10,622,000
Office furniture and equipment	1,074,000	1,027,000
Leasehold improvements	497,000	463,000
	12,441,000	12,467,000
Less accumulated depreciation and amortization	(9,534,000)	(9,152,000)
	$ 2,907,000	$ 3,315,000