Note 5 - Property and Equipment - Property and Equipment (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Buildings	$ 493,000	$ 493,000
Machinery and equipment	12,227,000	11,231,000
Office furniture and equipment	1,390,000	1,260,000
Leasehold improvements	508,000	508,000
Software	438,000	373,000
	15,056,000	13,865,000
Less accumulated depreciation and amortization	(11,113,000)	(10,621,000)
Total net property and equipment	$ 3,943,000	$ 3,244,000	[1]

[1] The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.