Note 9 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

	Number of options			Weighted average exercise price
Outstanding December 31, 2019		3,200,750		$	0.45
Granted		2,745,000			0.33
Exercised		-			-
Cancelled		(70,000	)		(0.42	)
Outstanding, December 31, 2020		5,875,750		$	0.39
Granted		1,075,000			0.39
Exercised		-			-
Cancelled		(140,000	)		(0.35	)
Outstanding March 31, 2021		6,810,750		$	0.39

Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

Exercise prices per share		Number outstanding		Number exercisable		Expiry date
$	0.33		2,645,000		87,000	June 30, 2025
	0.39		1,035,000		135,000	February 1, 2026
	0.40		620,000		620,000	December 20, 2021
	0.42		522,750		486,650	November 8, 2022
	0.42		713,000		713,000	June 4, 2023
	0.50		1,275,000		1,275,000	June 4, 2023
			6,810,750		3,316,650