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Note 9 - Income Taxes (Details Textual) - USD ($)			3 Months Ended		6 Months Ended
Note 9 - Income Taxes (Details Textual) - USD ($)	Jan. 02, 2018	Jan. 01, 2018	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Jun. 30, 2025
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					25.50%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent					25.50%
Effective Income Tax Rate Reconciliation, Percent			0.00%	(2.00%)	(1.00%)	(1.00%)
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
Domestic Tax Jurisdiction [Member]
Unrecognized Tax Benefits			$ 0		$ 0