Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) |
12 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Cost of Product and Service Sold | $ 43,072,000 | $ 48,791,000 |
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years | |
| Liability for Uncertainty in Income Taxes, Current | $ 0 | 0 |
| Accounts Receivable, Allowance for Credit Loss | $ 20,000 | 20 |
| Building and Building Improvements [Member] | ||
| Property, Plant and Equipment, Useful Life (Year) | 15 years | |
| Machinery and Equipment [Member] | ||
| Property, Plant and Equipment, Useful Life (Year) | 7 years | |
| Air Transportation Equipment [Member] | ||
| Property, Plant and Equipment, Useful Life (Year) | 5 years | |
| Shipping and Handling [Member] | ||
| Cost of Product and Service Sold | $ 690,000 | $ 927,000 |
| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount recognized for uncertainty in income taxes classified as current. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Useful life of property, plant, and equipment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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