Note 11 - Debt - Loans With Governmental Agencies (Details)	3 Months Ended
	Dec. 31, 2019 USD ($)
Principal, loans with governmental agencies	$ 320,440
Loans With Governmental Agencies [Member]
Principal, loans with governmental agencies	$ 320,440
Loans With Governmental Agencies [Member] | Ministry of Economy and Competitiveness, Debt, Due February 2, 2022 [Member]
Due date, loans with governmental agencies	Feb. 02, 2022
Principal, loans with governmental agencies	$ 50,610
Loans With Governmental Agencies [Member] | Ministry of Economy and Competitiveness, Debt, Due February 2, 2024 [Member]
Due date, loans with governmental agencies	Feb. 02, 2024
Principal, loans with governmental agencies	$ 269,830	[1]

[1] This loan is secured by $269,830 of cash pledged as collateral by Genasys Spain, which is the current balance of the loan. This amount is included in restricted cash at December 31, 2019. The Company expects the Ministry of Economy and Competitiveness to declare the terms of the loan satisfied within fiscal 2020 and that the outstanding balance of the loan will be paid in full during fiscal 2020. Accordingly, this has been included in the current portion of notes payable as of December 31, 2019.