Note 4 - Convertible Promissory Note (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

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

	Series A
	September 30, 2019	December 31, 2018
Market price of common stock	$6.63	$2.70
Expected volatility	93%	94%
Contractual term (years)	1.4	2.2
Discount rate	1.70%	2.48%
Dividend rate	0%	0%
Exercise price	$80.00	$80.00

Convertible Debt [Member]

Notes Tables

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

Stock price at date of issuance	$	3.05
Exercise price (1)	$	1.80
Risk-free interest rate		1.8	%
Expected dividend yield		--
Expected term (in years)		3.02
Expected volatility		93	%