Note 1 - Organization and Basis of Presentation - Ownership (Details)	Sep. 30, 2022
Express Test Corporation Dormant [Member]
Ownership	100.00%
Trio Tech Reliability Services Dormant [Member]
Ownership	100.00%
KTS Incorporated, dba Universal Systems (Dormant) [Member]
Ownership	100.00%
European Electronic Test Centre (Dormant) [Member]
Ownership	100.00%
Trio Tech International Pte Ltd [Member]
Ownership	100.00%
Universal (Far East) Pte. Ltd. [Member]
Ownership	100.00%	[1]
Trio-Tech International (Thailand) Co. Ltd. [Member]
Ownership	100.00%	[1]
Trio-Tech (Bangkok) Co. Ltd [Member]
Ownership	100.00%	[1]
Trio-Tech (Malaysia) Sdn. Bhd.[Member]
Ownership	55.00%
Trio-Tech (Kuala Lumpur) Sdn. Bhd. [Member]
Ownership	55.00%
Prestal Enterprise Sdn. Bhd. [Member]
Ownership	76.00%
Trio-Tech (SIP) Co., Ltd [Member]
Ownership	100.00%	[1]
Trio-Tech (Chongqing) Co. Ltd [Member]
Ownership	100.00%	[1]
SHI International Pte. Ltd. (Dormant) [Member]
Ownership	55.00%
PT SHI Indonesia (Dormant) [Member]
Ownership	52.00%
Trio-Tech (Tianjin) Co., Ltd, [Member]
Ownership	100.00%	[1]
Trio-tech (Jiangsu) Co. Ltd. [Member]
Ownership	51.00%

[1] 100% owned by Trio-Tech International Pte. Ltd.