Note 10 - Stockholders' Equity - Stock Option Activity (Details)	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Outstanding, number of options, balance (in shares) | shares	3,200,750
Outstanding, weighted average exercise price, balance (in dollars per share) | $ / shares	$ 0.45
Granted, number of options (in shares) | shares	2,745,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in CAD per share) | $ / shares
Exercised, number of options (in shares) | shares
Exercised, weighted average exercise price (in dollars per share) | $ / shares
Cancelled, number of options (in shares) | shares	(70,000)
Cancelled, weighted average exercise price (in dollars per share) | $ / shares	$ (0.42)
Outstanding, number of options, balance (in shares) | shares	5,875,750
Outstanding, weighted average exercise price, balance (in dollars per share) | $ / shares	$ 0.45