EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ (5)	$ 274
Income/(loss) attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	(3)	(1)
Net income attributable to Trio-Tech International common shareholders	$ (8)	$ 273
Weighted average number of common shares outstanding - basic (in thousands)	3,686	3,673
Dilutive effect of stock options (in thousands)	80	17
Number of shares used to compute earnings per share - diluted (in thousands)	3,766	3,690
Basic earnings per share from continuing operations attributable to Trio-Tech International	$ .00	$ 0.07
Basic earnings per share from discontinued operations attributable to Trio-Tech International	.00	.00
Basic Earnings per Share from Net Income Attributable to Trio-Tech International	.00	0.07
Diluted earnings per share from continuing operations attributable to Trio-Tech International	0.00	0.07
Diluted earnings per share from discontinued operations attributable to Trio-Tech International	0.00	0.00
Diluted Earnings per Share from Net Income Attributable to Trio-Tech International	$ 0.00	$ 0.07