Note 1 - Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Property, Plant and Equipment [Table Text Block]

Classification	Useful life in years
Machinery and equipment		3	-	5
Furniture and fixtures		5	-	7
Building			39

(in thousands)	201 9			201 8
Machinery and equipment	$	4,995		$	3,321
Furniture and fixtures		203			194
Building		301			313
Subtotal		5,499			3,828
Accumulated depreciation		(3,322	)		(2,315	)
Property and equipment, net	$	2,177		$	1,513

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Year ended December 31,	201 9			201 8
Risk free interest rate		2.58	%		1.91	%
Expected life of option in years		10			10
Expected dividend yield rate		0	%		0	%
Expected volatility		51	%		52	%