The aggregate intrinsic value of warrants or rights outstanding.

No definition available.

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- Definition

The weighted average remaining contractual term of warrants and rights outstanding.

+ References

No definition available.

+ Details

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

+ Details

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

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- 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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

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- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

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Note 5 - Stock Purchase Warrants (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Nov. 30, 2021	Dec. 31, 2020	Nov. 30, 2020	Oct. 31, 2020	Dec. 31, 2019	Sep. 17, 2018	May 31, 2016
May 2016 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									6,180,000
May 2016 Warrants [Member] \| Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 0.50
May 2016 Warrants [Member] \| Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 0.75
Warrants Issued with the 2018 Convertible Notes [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								466,666
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.15
Class of Warrant or Right, Outstanding, Weighted Average Remaining Contractual Term (Year)	1 year 6 months
Class of Warrant or Right, Outstanding, Aggregate Intrinsic Value	$ 0
Warrants Issued with 2019 Senior Secured Notes Upon Conversion [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							3,977,971
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 0.40
Warrants and Rights Outstanding, Term (Year)							5 years
Warrants Issued to Employees [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						2,887,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 0.40
Warrants and Rights Outstanding, Term (Year)						5 years
Modified Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					6,865,461
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.20	$ 0.40	$ 0.20	$ 0.40
Proceeds from Warrant Exercises		$ 1,373,092