EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ 425	$ 346	$ 699	$ 415
Income / (loss) attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	1	2	0	(2)
Net income attributable to Trio-Tech International common shareholders	$ 426	$ 348	$ 699	$ 413
Weighted average number of common shares outstanding - basic	3,673	3,673	3,673	3,673
Dilutive effect of stock options	52	108	33	142
Number of shares used to compute earnings per share - diluted	3,725	3,781	3,706	3,815
Basic earnings per share from continuing operations attributable to Trio-Tech International	$ 0.12	$ 0.09	$ 0.19	$ 0.11
Basic earnings per share from discontinued operations attributable to Trio-Tech International	0	0	0	0
Basic Earnings per Share from Net Income Attributable to Trio-Tech International	0.12	0.09	0.19	0.11
Diluted earnings per share from continuing operations attributable to Trio-Tech International	0.11	0.09	0.19	0.11
Diluted earnings per share from discontinued operations attributable to Trio-Tech International	0	0	0	0
Diluted Earnings per Share from Net Income Attributable to Trio-Tech International	$ 0.11	$ 0.09	$ 0.19	$ 0.11

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