Note 13 - Right-of-use Assets - Right-of-use Assets (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 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	$ (13,589)	$ (24,943)	(28,961)	$ (37,503)	(72,416)
Operating lease right-of-use assets	$ 114,621		114,621		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