EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
(Loss) / Income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ (575)	$ 879
Income / (loss) attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	(16)	(1)
Net (Loss) / income attributable to Trio-Tech International common shareholders	$ (591)	$ 878
Weighted average number of common shares outstanding - basic	3,768	3,673
Dilutive effect of stock options	117	53
Number of shares used to compute earnings per share - diluted	3,885	3,726
Basic (Loss) / Earnings per Share:
Basic (Loss) / earnings per share from continuing operations attributable to Trio-Tech International	$ (.16)	$ .24
Basic (Loss) / earnings per share from discontinued operations attributable to Trio-Tech International	0	0
Basic (Loss) / Earnings per Share from Net Income Attributable to Trio-Tech International	(.16)	0.24
Diluted (Loss) / Earnings per Share:
Diluted (Loss) / earnings per share from continuing operations attributable to Trio-Tech International	(.15)	.24
Diluted (Loss) / earnings per share from discontinued operations attributable to Trio-Tech International	0	0
Diluted (Loss) / Earnings per Share from Net Income Attributable to Trio-Tech International	$ (.15)	$ 0.24