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Note 2 - Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
Sep. 30, 2023
Sep. 30, 2022
Equipment, software and tooling $ 1,427,522 $ 1,399,288
Automobiles 4,460 4,187
Leasehold improvements 382,122 380,586
Furniture and fixtures 222,554 215,856
Total property and equipment before accumulated depreciation 2,036,658 1,999,917
Accumulated depreciation (1,920,850) (1,829,588)
Property, Plant, and Equipment, Excluding Monitoring Equipment [Member]    
Property and equipment, net of accumulated depreciation $ 115,808 $ 170,329