Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance	$ 8,639,000	$ 8,639,000
Operating Lease, Right-of-Use Asset	247,043
Operating Lease, Liability, Total	247,043
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 300,000
Operating Lease, Liability, Total			$ 300,000
In-Process Research and Development Asset [Member]
Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance	8,600,000	8,600,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 0	$ 0
Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	15 years