EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ 274	$ 69
Income / (loss) attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	(1)	(4)
Net income attributable to Trio-Tech International common shareholders	$ 273	$ 65
Weighted average number of common shares outstanding - basic	3,673,000	3,608,000
Dilutive effect of stock options	17,000	124,000
Number of shares used to compute earnings per share - diluted	3,690,000	3,732,000
Basic earnings per share from continuing operations attributable to Trio-Tech International	$ 0.07	$ 0.02
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	0.07	0.02
Diluted earnings per share from continuing operations attributable to Trio-Tech International	0.07	0.02
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	$ 0.07	$ 0.02

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