Note 9 - Preferred Stock and Common Stock Warrants (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	September 30,			December 31,
	2020			2019
Stock price	$	2.98		$	6.14
Exercise price	$	0.01		$	0.01
Risk-free rate		0.1	%		1.6	%
Volatility		53.9	%		27.6	%
Term (years)		1.1			1.8