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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

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Amount of unrecognized tax benefits.

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