Note 8 - Derivaitves - Change in Fair Value of Derivative Liabilities (Details) - USD ($)	3 Months Ended
Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Derivative liability balance	$ 4,629,570	$ 2,814,798	$ 50,989
Gain recognized to revalue derivative instrument at fair value	(422,081)	(27,107)
Reclassification of Warrant liabilities to Equity on exercise	(1,701,756)
Loss recognized to revalue derivative instrument at fair value	422,081	27,107
A, B and Agent Warrants [Member]
Derivative instrument recognized		2,669,995
Promissory Note 2020 [Member]
Derivative instrument recognized	20,542	$ 120,921
Warrants and Agent Warrants In Connection With May 2020 Warrant [Member]
Derivative liability balance	1,324,184
Warrants and Agent Warrants In Connection With June 2020 Warrant [Member]
Derivative liability balance	$ 1,749,721

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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The amount of the liability for the conversion option reclassified to stockholders' equity when the embedded option no longer required separation from the host instrument.

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- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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