Note 11 - Right-of-use Assets - Right-of-use Assets (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Operating lease right-of-use assets	$ 134,914
Initial recognition of operating lease right-of-use assets			76,557
Capitalization of operating lease right-of-use assets			125,474
Amortization of operating lease right-of use assets	(15,372)	$ (12,560)	(72,416)
Operating lease right-of-use assets	128,210		134,914
Facility in Vancouver, Canada [Member]
Capitalization of operating lease right-of-use assets			125,474
Operating Lease, License Agreement [Member]
Capitalization of operating lease right-of-use assets	$ 8,668		$ 5,299