Note 7 - Convertible Promissory Notes (Tables)

12 Months Ended

Dec. 31, 2020

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	%