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Note 10 - Income Taxes (Details Textual) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 02, 2018 | Jan. 01, 2018 | Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Jun. 30, 2025
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 25.50% |  |
Effective Income Tax Rate Reconciliation, Percent |  |  | (2.00%) | (3.00%) | (1.00%) | (2.00%) |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent |  |  |  |  | 25.50% |  |
Latvian State Revenue Service [Member] | ISP Optics Latvia [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 25.00% | 20.00% |  |  |  |  |
LPOIZ [Member] | State Administration of Taxation, China [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  | 15.00% |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  |  | $ 32,000 |  | $ 32,000 |  | $ 32,000
Income Tax Jurisdiction, Domestic Federal [Member] |  |  |  |  |  |  |
Unrecognized Tax Benefits |  |  | $ 0 |  | $ 0 |  |

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