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Note 5 - Computation of Net Loss Per Common Share (Details Textual) - shares shares in Millions	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1.1
Shares Tied to Derivative Liability [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		1.0
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		0.1	0.1

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

+ Details

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Period Type:	duration

X

- Details

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X

- Details

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