EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ 246	$ 425	$ 241	$ 699
Income/(loss) attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	(11)	1	(14)	0
Net income attributable to Trio-Tech International common shareholders	$ 235	$ 426	$ 227	$ 699
Weighted average number of common shares outstanding - basic (in thousands)	3,710	3,673	3,710	3,673
Dilutive effect of stock options (in thousands)	90	52	83	33
Number of shares used to compute earnings per share - diluted (in thousands)	3,800	3,725	3,793	3,706
Basic earnings per share from continuing operations attributable to Trio-Tech International	$ 0.06	$ 0.12	$ 0.06	$ 0.19
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	0.06	0.12	0.06	0.19
Diluted earnings per share from continuing operations attributable to Trio-Tech International	0.06	.11	0.06	0.19
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	$ 0.06	$ .11	$ 0.06	$ 0.19