EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ 967	$ 1,548
Income / (loss) attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	(1)	(3)
Net income attributable to Trio-Tech International common shareholders	$ 966	$ 1,545
Weighted average number of common shares outstanding - basic	3,673,000	3,673,000
Dilutive effect of stock options	49,000	89,000
Number of shares used to compute earnings per share - diluted	3,722,000	3,762,000
Basic Earnings per Share:
Basic earnings per share from continuing operations attributable to Trio-Tech International	$ 0.26	$ 0.42
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	0.26	0.42
Diluted Earnings per Share:
Diluted earnings per share from continuing operations attributable to Trio-Tech International	0.26	0.41
Diluted earnings per share from discontinued operations attributable to Trio-Tech International	.00	.00
Diluted Earnings per Share from Net Income Attributable to Trio-Tech International	$ 0.26	$ 0.41