Note 18 - (Losses) 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, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
(Loss)/income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ (167)	$ 177	$ 1,603	$ 418
Income / (loss) attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	0	1	2	(13)
Net (loss)/income attributable to Trio-Tech International Common Shareholders	$ (167)	$ 178	$ 1,605	$ 405
Basic (in shares)	3,949	3,913	3,949	3,913
Dilutive effect of stock options (in shares)	272	133	191	117
Number of shares used to compute earnings per share diluted (in shares)	4,221	4,046	4,140	4,030
Basic (loss) / earnings per share from continuing operations attributable to Trio-Tech International (in dollars per share)	$ (0.04)	$ 0.05	$ 0.40	$ 0.11
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)	(0.04)	0.05	0.40	0.11
Diluted earnings per share from continuing operations attributable to Trio-Tech International (in dollars per share)	(0.04)	0.04	0.38	0.10
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)	$ (0.04)	$ 0.04	$ 0.38	$ 0.10