Note 4 - Equipment and Leasehold Improvements, Net (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Property, Plant and Equipment [Table Text Block]

	Year Ended December 31,
	2019			2018			Estimated Useful Life (Years)
Machinery and equipment	$	6,107,000		$	6,136,000		2.5	-	10
Computer and software		631,000			664,000		2	-	5
Office equipment		256,000			264,000		5	-	10
Leasehold improvements		932,000			931,000		Shorter of 5 years or remaining lease term
Total equipment		7,926,000			7,995,000
Less accumulated depreciation		(5,898,000	)		(5,433,000	)
Total equipment and leasehold improvements, net	$	2,028,000		$	2,562,000