Note 18 - Earnings Per Share - Computation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
(Loss) / Income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ (10)	$ (167)	$ 1,384	$ 1,603
Income / (loss) attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	3	0	(2)	2
Net (loss) / income attributable to Trio-Tech International Common Shareholders	$ (7)	$ (167)	$ 1,382	$ 1,605
Basic (in shares)	4,075	3,949	4,075	3,949
Dilutive effect of stock options (in shares)	84	272	86	191
Number of shares used to compute earnings per share diluted (in shares)	4,159	4,221	4,161	4,140
Basic (loss) / earnings per share from continuing operations attributable to Trio-Tech International (in dollars per share)	$ 0	$ (0.04)	$ 0.34	$ 0.40
Basic (loss) / earnings per share from discontinued operations attributable to Trio-Tech International (in dollars per share)	0	0	0	0
Basic (loss) / earnings per share from net income attributable to Trio-Tech International (in dollars per share)	0	(0.04)	0.34	0.40
Diluted (loss) / earnings per share from continuing operations attributable to Trio-Tech International (in dollars per share)	0	(0.04)	0.33	0.38
Diluted (loss) / earnings per share from discontinued operations attributable to Trio-Tech International (in dollars per share)	0	0	0	0
Diluted (loss) / earnings per share from net income attributable to Trio-Tech International (in dollars per share)	$ 0	$ (0.04)	$ 0.33	$ 0.38