Note 7 - Stock Options and Other Compensation (Details Textual)	Jun. 30, 2025 $ / shares shares	Jun. 30, 2024 $ / shares shares	May 31, 1989
Number Of Key Executive Officer To Whom Non Statutory Stock Option Granted			4
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number \| shares	767,500	767,500
Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 1	$ 1
Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 1.25	$ 1.25

Number of key executive officer to whom non statutory stock options granted.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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