EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Notes to Financial Statements
Income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ (736)	$ 351	$ 520	$ 970
Loss attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	(3)	(1)	(11)	(7)
Net income attributable to Trio-Tech International common shareholders	$ (739)	$ 350	$ 509	$ 963
Weighted average number of common shares outstanding - basic	3,553	3,523	3,553	3,523
Dilutive effect of stock options	219	116	225	54
Number of shares used to compute earnings per share - diluted	3,772	3,639	3,778	3,577
Basic earnings per share from continuing operations attributable to Trio-Tech International	$ (0.21)	$ 0.10	$ 0.15	$ 0.28
Basic earnings per share from discontinued operations attributable to Trio-Tech International	0.00	0.00	0.00	0.00
Basic Earnings per Share from Net Income Attributable to Trio-Tech International	(0.21)	0.10	0.15	0.28
Diluted earnings per share from continuing operations attributable to Trio-Tech International	(0.20)	0.10	0.14	0.27
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	$ (0.20)	$ 0.10	$ 0.14	$ 0.27