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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Product Warranty Liability [Table Text Block] |
(In thousands) |  | Warranty Provision |
Balance as of June 30, 2023 |  | $ | 88 |
Accruals for new warranties issued |  |  | 172 |
Settlements made |  |  | (76 | )
Balance as of June 30, 2024 |  |  | 184 |
Accruals for new warranties issued |  |  | 75 |
Settlements made |  |  | (62 | )
Balance as of June 30, 2025 |  | $ | 197 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
Revenue by Segment (In thousands) |  | June 30, 2025 |  |  | June 30, 2024 |
United States |  | $ | 730 |  |  | $ | - |
Foreign Countries |  |  | 319 |  |  |  | 1,664 |
Total Revenue |  | $ | 1,049 |  |  | $ | 1,664 |
Disaggregation of Revenue [Table Text Block] |
(In thousands) |  | June 30, 2025 |  |  | June 30, 2024 |
Product Revenue |  | $ | 804 |  |  | $ | 1,576 |
Grant Revenue |  |  | 115 |  |  |  | - |
Service Revenue |  |  | 130 |  |  |  | 88 |
Total Revenue |  | $ | 1,049 |  |  | $ | 1,664 |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-8 + Details
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