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Note 4 - Leases (Details Textual) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 03, 2020 USD ($) ft² | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Apr. 27, 2021 ft²
Operating Lease, Payments |  | $ 86 | $ 195 |
Finance Lease, Principal Payments |  | $ 95 | $ 12 |
Austin, Texas [Member] |  |  |  |
Increase (Decrease) in Operating Lease Liability | $ (506) |  |  |
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] | Office Building [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | ft² | 5,219 |  |  |
Increase (Decrease) in Operating Lease, Right-of-Use Assets | $ (539) |  |  |

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- Definition Amount of cash outflow for principal payment on finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 + Details
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