Note 2 - Liquidity and Uncertainties (Details Textual) - USD ($)	1 Months Ended		9 Months Ended
	Jun. 30, 2020	Apr. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Proceeds from Issuance of Common Stock			$ 18,043,284	$ 1,974,547
Cash and Cash Equivalents, at Carrying Value, Ending Balance			14,448,903		$ 1,516,272
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total			$ 12,932,631	$ 967,820
April 6, 2020 Public Offering [Member]
Proceeds from Issuance of Common Stock		$ 4,600,000
June 30, 2020 Public Offering [Member]
Proceeds from Issuance of Common Stock	$ 13,400,000