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Note 9 - Subsequent Events (Details Textual) - USD ($)				1 Months Ended	6 Months Ended
	Jul. 31, 2022	Jun. 01, 2022	May 27, 2022	Aug. 31, 2022	Jun. 30, 2022	Jun. 30, 2021
Class of Warrant or Right, Outstanding (in shares)					23,405,329
Proceeds from Warrant Exercises					$ 591	$ 3,174,156
Pre-Funded Warrants [Member]
Class of Warrant or Right, Exercised (in shares)		3,690,910	1,980,304
Class of Warrant or Right, Outstanding (in shares)					5,400,000
Preferred Investment Options [Member] | Forecast [Member]
Class of Warrant or Right, Exercised (in shares)				3,030,304
Class of Warrant or Right, Outstanding (in shares)				9,090,910
Proceeds from Warrant Exercises				$ 5,000,000
Subsequent Event [Member] | Pre-Funded Warrants [Member]
Class of Warrant or Right, Exercised (in shares)	5,400,000
Class of Warrant or Right, Outstanding (in shares)	0
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)					68,500
Restricted Stock [Member] | Subsequent Event [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)	75,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 60,750

X

- Definition

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+ References

No definition available.

+ Details

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X

- Definition

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+ References

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X

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
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-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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