Note 3 - Summary of Significant Accounting Policies - Inventory (Details) - USD ($) |
Jun. 30, 2026 |
Apr. 30, 2026 |
Dec. 31, 2025 |
Apr. 30, 2025 |
|---|---|---|---|---|
| Raw materials | $ 322,996 | $ 322,996 | ||
| Sub-assemblies | 373,886 | 347,036 | ||
| Work in progress | 21,741 | 21,741 | ||
| Finished goods | 22,581 | 44,069 | ||
| Reserve for obsolescence | (85,575) | (85,575) | ||
| Total Inventory | $ 655,629 | $ 655,629 | $ 650,267 | $ 650,267 |
| X | ||||||||||
- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of valuation reserve for inventory. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount before valuation and LIFO reserves of other inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|