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Note 2 - Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
Sep. 30, 2025
Sep. 30, 2024
Equipment, software and tooling $ 125,949 $ 114,088
Leasehold improvements 98,979 237,722
Furniture and fixtures 135,846 120,364
Other fixed assets 431,988 275,035
Property, Plant, and Equipment, Excluding Monitoring Equipment [Member]    
Total property and equipment before accumulated depreciation 792,762 747,209
Accumulated depreciation (294,873) (430,003)
Property and equipment, net of accumulated depreciation $ 497,889 $ 317,206