Note 11 - Debt - Loans With Governmental Agencies (Details)	12 Months Ended
	Sep. 30, 2019 USD ($)
Principal, loans with governmental agencies	$ 312,491
Loans With Governmental Agencies [Member]
Principal, loans with governmental agencies	$ 312,491
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	$ 49,355
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	$ 263,136	[1]

[1] This loan is secured by $263,136 of cash pledged as collateral by Genasys Spain, which is the current balance of the loan. This amount represents 66.6% of the original principal received. This amount is included in restricted cash at September 30, 2019. The Company expects the Ministry of Economy and Competitiveness to declare the terms of the loan satisfied within fiscal year 2020 and that the outstanding balance of the loan will be paid in full during fiscal year 2020. Accordingly, this has been included in the current portion of notes payable as of September 30, 2019.