Note 19 - 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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income / (loss) attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ 71	$ (10)	$ 801	$ 1,384
(Loss) / Income attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	(1)	3	6	(2)
Net Income / (Loss) Attributable to Trio-Tech International Common Shareholders	$ 70	$ (7)	$ 807	$ 1,382
Weighted average number of common shares outstanding - basic (in shares)	4,176	4,075	4,131	4,075
Dilutive effect of stock options (in shares)	106	84	143	86
Number of shares used to compute earnings per share - diluted (in shares)	4,282	4,159	4,274	4,161
Basic earnings per share from continuing operations attributable to Trio-Tech International (in dollars per share)	$ 0.02	$ 0	$ 0.19	$ 0.34
Basic earnings per share from discontinued operations attributable to Trio-Tech International (in dollars per share)	0	0	0	0
Basic earnings per share from net income attributable to Trio-Tech International (in dollars per share)	0.02	0	0.19	0.34
Diluted earnings per share from continuing operations attributable to Trio-Tech International (in dollars per share)	0.02	0	0.19	0.33
Diluted earnings per share from discontinued operations attributable to Trio-Tech International (in dollars per share)	0	0	0	0
Diluted earnings per share from net income attributable to Trio-Tech International (in dollars per share)	0.02	0	0.19	0.33
Approximation [Member]
Diluted earnings per share from continuing operations attributable to Trio-Tech International (in dollars per share)	0.02	0	0.19	0.33
Diluted earnings per share from discontinued operations attributable to Trio-Tech International (in dollars per share)	0	0	0	0
Diluted earnings per share from net income attributable to Trio-Tech International (in dollars per share)	$ 0.02	$ 0	$ 0.19	$ 0.33