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Significant Accounting Policies (Policies)	9 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	General The Company’s unaudited interim condensed consolidated financial statements included herein have been prepared in accordance with the instructions to Form 10-Q and Article 8 of Regulation S-X and the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles have been condensed or omitted pursuant to such rules and regulations. In management’s opinion, the accompanying financial statements reflect adjustments necessary to present fairly the financial position, results of operations, and cash flows for those periods indicated, and contain adequate disclosure to make the information presented not misleading. Adjustments included herein are of a normal, recurring nature unless otherwise disclosed in the footnotes. The condensed consolidated financial statements and notes thereto should be read in conjunction with the Company’s audited financial statements and notes thereto for the year ended September 30, 2020 included in the Company’s Annual Report on Form 10-K, as filed with the SEC on December 10, 2020. The accompanying condensed consolidated balance sheet at September 30, 2020 has been derived from the audited consolidated balance sheet at September 30, 2020 contained in the above referenced Form 10-K. Results of operations for interim periods are not necessarily indicative of the results of operations for a full year.
Consolidation, Policy [Policy Text Block]	Principles of consolidation The Company has eight wholly owned subsidiaries, Genasys II Spain, S.A.U (“Genasys Spain”), Genasys Communications Canada ULC, Genasys Singapore PTE Ltd, Genasys Puerto Rico, LLC, Zonehaven, LLC, and Genasys Inc. (branch) in the United Arab Emirates and two currently inactive subsidiaries, Genasys America de CV and LRAD International Corporation. The condensed consolidated financial statements include the accounts of these subsidiaries after elimination of intercompany transactions and accounts.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash, cash equivalents and restricted cash The Company considers all highly liquid investments with an original maturity of three months or less, when purchased, to be cash equivalents. As of June 30, 2021, the amount of cash and cash equivalents was $14,540. As of September 30, 2020, the amount of cash and cash equivalents was $23,319. The Company considers any amounts pledged as collateral or otherwise restricted for use in current operations to be restricted cash. In addition, the Company excludes from cash and cash equivalents cash required to fund specific future contractual obligations related to business combinations. Restricted cash is classified as a current asset unless amounts are not expected to be released and available for use in operations within one year. As of June 30, 2021, the current portion of restricted cash was $286 and the noncurrent portion was $1,202. As of September 30, 2020, the current portion of restricted cash was $282 and the noncurrent portion was $395.
Immaterial Correction of Prior Period Financial Statements, Policy [Policy Text Block]	Immaterial correction of prior period financial statements During the quarter ended December 31, 2020, Company management identified an immaterial error in the previously issued September 30, 2020 consolidated balance sheet. This error resulted in an overstatement of prepaid expenses and accrued liabilities of $5,205 related to a foreign currency forward contract which was presented on a gross basis rather than on a net basis. There was no impact to the consolidated statement of operations or the consolidated statement of cash flows for the year ended September 30, 2020, as a result of this misstatement. Further, there was no impact to the condensed consolidated financial statements as of, and for the nine months ended June 30, 2021, as the forward contract was settled during the first quarter of fiscal 2021.  SEC Staff Accounting Bulletin: No. 99 – Materiality and No. 108 – Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements were used by management to evaluate the impact of the misstatement. Management concluded that this misstatement had no material impact on either the accompanying condensed consolidated balance sheet as of June 30, 2021, or the previously issued consolidated balance sheet for the year ended September 30, 2020, and therefore the misstatement was corrected in the accompanying condensed consolidated balance sheet for the year ended September 30, 2020. All financial information contained in the accompanying notes to these condensed consolidated financial statements has been revised to reflect the correction of this error.
Reclassification, Comparability Adjustment [Policy Text Block]	Reclassifications Where necessary, the prior year’s information has been reclassified to conform to the current year presentation.

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Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).

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