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Note 7 - Financial Instruments (Details Textual) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2022	Dec. 31, 2021 USD ($) shares	Sep. 02, 2016 USD ($) $ / shares shares
(Gain) Loss on Change in Fair Value of Warrant Liability	$ (0)	$ 1,066,522	$ (400,663)	$ (294,548)
Warrants and Rights Outstanding	$ 0		0			$ 6,521,441
The 2016 Warrant [Member]
Class of Warrant or Right Outstanding, Common Stock Value Used to Determine Number of Shares Called							$ 4,000,000.0
Class of Warrant or Right Outstanding, Common Stock Price Per Share Used to Determine Number of Shares Called (in dollars per share) | $ / shares							$ 2.29
Warrants and Rights Outstanding, Term (Year)							10 years
Class of Warrant or Right, Subscription Price of Warrants or Rights (in dollars per share) | $ / shares							$ 1.50
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares							$ 1.50
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares						1.0	2.7
(Gain) Loss on Change in Fair Value of Warrant Liability			$ 400,000
Warrants and Rights Outstanding						$ 6,500,000
The 2016 Warrant [Member] | Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input					0	0
The 2016 Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input						0.0121
The 2016 Warrant [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input						4.7
The 2016 Warrant [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input						0.55

X

- Definition

The price per share of common stock to be used in determining the number of shares called by each warrant or right.

+ References

No definition available.

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- Definition

The value of common stock to be used in determining the number of shares called by each warrant or right.

+ References

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- Definition

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+ References

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- Definition

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+ References

No definition available.

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- Definition

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+ 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

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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

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

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- Definition

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+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

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+ 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

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