Note 2 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2021 USD ($) $ / shares
Cash, Uninsured Amount		$ 3,715,850	$ 3,037,903
Accounts Receivable, Allowance for Credit Loss, Writeoff	$ 127,527		201,469
Allowance for Credit Memos	23,065	0
Inventory Write-down	3,772		0
Property, Plant and Equipment, Disposals	8,669		794,555
Depreciation, Nonproduction	95,099		144,054
Depreciation, Lessor Asset under Operating Lease	1,539,234	1,380,558
Disposal of Lease Monitoring Equipment	305,300	280,783
Research and Development Expense	2,735,060	2,432,448
Advertising Expense	$ 13,707	$ 14,037
Unrecognized Tax Benefits			$ 0
Common Stock, Par or Stated Value Per Share | $ / shares		$ 0.0001	$ 0.0001
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Total (in shares) | shares	25,352
Share Price (in dollars per share) | $ / shares (in dollars per share) | $ / shares	$ 0.51	$ 0.49
Restricted Stock [Member]
Share-Based Payment Arrangement, Expense	$ 159,522	$ 207,547
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]
Number of Major Customers	2		2
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	3 years
Property, Plant and Equipment, Useful Life (Year) (Year)	3 years
Equipment Leased Under Contractual Service Agreements, Useful Life (Year)	1 year
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	20 years
Property, Plant and Equipment, Useful Life (Year) (Year)		7 years
Equipment Leased Under Contractual Service Agreements, Useful Life (Year)	3 years