Note 5 - Equipment and Leasehold Improvements, Net (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Property, Plant and Equipment [Table Text Block]

	Year Ended December 31,
	2020			2019			Estimated Useful Life (Years)
Machinery and equipment	$	6,004,000		$	6,107,000		2.5	-	10
Computer and software		631,000			631,000		2	-	5
Office equipment		256,000			256,000		5	-	10
Leasehold improvements		932,000			932,000		Shorter of 5 years or remaining lease term
Total equipment		7,823,000			7,926,000
Less accumulated depreciation		(6,399,000	)		(5,898,000	)
Total equipment and leasehold improvements, net	$	1,424,000		$	2,028,000