Note 1 - Basis of Presentation and Summary of Significant Accounting Policies. (Details Textual) $ in Thousands	12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Number of Operating Segments	4
Net Income (Loss) Available to Common Stockholders, Basic, Total	$ 2,395	$ (591)
Retained Earnings (Accumulated Deficit), Total	9,219	6,824
Research and Development Expense, Total	375	357
Subsidiaries [Member]
Retained Earnings (Accumulated Deficit), Total	$ 18,755	$ 16,683
Minimum [Member]
Trade Accounts Receivable, Credit Term (Day)	30 days
Maximum [Member]
Trade Accounts Receivable, Credit Term (Day)	90 days
Trio-tech (Jiangsu) Co. Ltd. [Member]
Noncontrolling Interest, Ownership Percentage by Parent	51.00%
Trio-Tech (Tianjin) Co., Ltd, [Member]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%