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Note 2 - Liquidity (Details Textual) - USD ($)	1 Months Ended	2 Months Ended		12 Months Ended
	Feb. 28, 2021	Mar. 15, 2021	Mar. 12, 2021	Dec. 31, 2020	Dec. 31, 2019
Proceeds from Issuance of Common Stock				$ 10,827,100
Proceeds from Warrant Exercises				$ 8,046,103	$ 3,888,425
Subsequent Event [Member]
Proceeds from Issuance of Common Stock	$ 1,000,000
Proceeds from Warrant Exercises		$ 2,200,000	$ 2,000,000

X

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: