Note 1 - Business Activity and Summary of Significant Accounting Policies 1 (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Jun. 30, 2025
Accounts Receivable, Allowance for Credit Loss	$ 483,000		$ 483,000			$ 236,000
Inventory Valuation Reserves	1,468,000		1,468,000			$ 1,413,000
Advertising Expense	0	$ 4,600	6,400	$ 16,800
Impairment of Intangible Assets (Excluding Goodwill)	$ 0	$ 0	$ 0		$ 0
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	11 years		11 years
Product Warranty Obligation, Term (Year)	1 year		1 year
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	20 years		20 years
Product Warranty Obligation, Term (Year)	3 years		3 years

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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-Topic 720
-SubTopic 35
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Amount of allowance for credit loss on accounts receivable.

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Useful life of finite-lived intangible asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

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Amount of impairment loss for finite- and indefinite-lived intangible assets and capitalized cost for software to be sold, leased, or marketed. Excludes goodwill.

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Amount of valuation reserve for inventory.

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Term of warranty or group of similar warranties, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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