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Note 3 - Leases (Details Textual)		3 Months Ended		9 Months Ended
	Jan. 20, 2025 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 01, 2022	Nov. 22, 2022 ft²	Apr. 27, 2021 ft²
Finance Lease, Right-of-Use Asset, Amortization		$ 7,000	$ 31,000	$ 69,000	$ 94,000
Operating Lease, Payments		43,000	41,000	128,000	124,000
Finance Lease, Principal Payments		$ 9,000	$ 45,000	$ 87,000	$ 136,000
Austin, Texas [Member] | Research And Development Facility [Member]
Area of Real Estate Property (Square Foot) | ft²								5,960
Lessee, Operating Lease, Term of Contract (Month)								36 months
Austin, Texas [Member] | Subleased Facility [Member]
Area of Real Estate Property (Square Foot) | ft²							3,900
Lessee, Operating Lease, Term of Contract (Month)						29 months
Austin, Texas [Member] | Donley Facilities [Member]
Operating Lease, Monthly Rent	$ 14,186

X

- Definition

Amount of monthly rent under operating lease.

+ References

No definition available.

+ Details

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X

- Definition

Area of a real estate property.

+ References

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X

- Definition

Amount of cash outflow for principal payment on finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
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-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-5

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X

- Definition

Amount of amortization expense attributable to right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147479041/842-20-45-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Term of lessee's operating lease, 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
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-5

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-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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