EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Notes to Financial Statements
Income attributable to Trio-Tech International common shareholders from continuing operations, net of tax	$ 678	$ 316	$ 1,254	$ 619
Loss attributable to Trio-Tech International common shareholders from discontinued operations, net of tax	(5)	(6)	(6)	(6)
Net income attributable to Trio-Tech International common shareholders	$ 673	$ 310	$ 1,248	$ 613
Weighted average number of common shares outstanding - basic	3,548,000	3,513,000	3,548,000	3,513,000
Dilutive effect of stock options	245,000	56,000	222,000	39,000
Number of shares used to compute earnings per share - diluted	3,793,000	3,569,000	3,770,000	3,552,000
Basic earnings per share from continuing operations attributable to Trio-Tech International	$ .19	$ .09	$ .35	$ .18
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	0.19	0.09	0.35	0.18
Diluted earnings per share from continuing operations attributable to Trio-Tech International	0.18	0.09	0.34	0.17
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	$ 0.18	$ 0.09	$ 0.34	$ 0.17