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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Net Income Attributable to Trio-Tech International Common Shareholders | $ 1,545 | $ 1,184
Earnings retained in subsidiaries | 14,019 | 12,393
Research and development costs | 345 | 451
Trio-Tech International [Member] |  |
Restricted term deposits | 1,478 | 1,468
55% owned Malaysian subsidiary |  |
Short-term deposits | 1,426 | 548
Restricted term deposits | 228 | 227
Trio-Tech Thailand |  |
Short-term deposits | $ 113 | $ 105

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