Note 3 - Business Acquisition (Details Textual) - USD ($)		12 Months Ended
	Aug. 01, 2025	Sep. 30, 2025	Sep. 30, 2024	Aug. 31, 2025
Payments to Acquire Businesses, Gross		$ 1,750,000	$ (0)
Goodwill		1,258,000	736,000
Geovox [Member]
BusinessCombination, ConsiderationTransferred, Cash Value	$ 1,700,000
Payments to Acquire Businesses, Gross	1,500,000
Business Combination, Consideration Transferred, Liabilities Incurred	200,000
Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount	$ 3,300,000			$ 3,300,000
Business Combination, Contingent Consideration, Earn Out Period (Year)	4 years
Goodwill	$ 500,000			500,000
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill	3,700,000			3,700,000
Business Combination, Contingent Consideration, Liability	$ 2,500,000	2,540,000	$ 0	$ 2,500,000
Professional Fees		$ 35,000