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Note 3 - Leases (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 01, 2022 USD ($) | Nov. 22, 2022 USD ($) ft² | Apr. 27, 2021 ft²
Lessee, Operating Lease, Liability, to be Paid, Total | $ 391 |  | $ 391 |  |  |  |
Operating Lease, Payments | 31 | $ 25 | 57 | $ 35 |  |  |
Finance Lease, Principal Payments | $ 38 | $ 15 | $ 77 | $ 18 |  |  |
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
Lessee, Operating Lease, Liability, to be Paid, Total |  |  |  |  |  | $ 95 |
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 |  |
Lessee, Operating Lease, Liability, to be Paid, Total |  |  |  |  | $ 156 |  |

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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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