EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ 81	$ 682	$ 780	$ 1,097
(Loss) / income attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	(11)	1	(11)	1
Net income attributable to Trio-Tech International common shareholders	$ 70	$ 683	$ 769	$ 1,096
Weighted average number of common shares outstanding - basic (in thousands)	3,673	3,673	3,673	3,673
Dilutive effect of stock options (in thousands)	86	12	61	73
Number of shares used to compute earnings per share - diluted (in thousands)	3,759	3,685	3,734	3,746
Basic earnings per share from continuing operations attributable to Trio-Tech International	$ 0.02	$ 0.19	$ 0.21	$ .30
Basic earnings per share from discontinued operations attributable to Trio-Tech International	.00	.00	.00	.00
Basic Earnings per Share from Net Income Attributable to Trio-Tech International	0.02	0.19	0.21	0.30
Diluted earnings per share from continuing operations attributable to Trio-Tech International	0.02	0.19	0.21	0.29
Diluted earnings per share from discontinued operations attributable to Trio-Tech International	0.00	0.00	0.00	0.00
Diluted Earnings per Share from Net Income Attributable to Trio-Tech International	$ 0.02	$ 0.19	$ 0.21	$ 0.29