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Note 1 - Organization and Basis of Presentation (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Sep. 30, 2021 | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2021 USD ($)
Number of Operating Segments |  | 4 |  | 4 |  |
Cash, Cash Equivalents, and Short-term Investments, Total | $ 12,523 |  |  | $ 12,523 |  |
Line of Credit Facility, Remaining Borrowing Capacity | 5,207 |  |  | 5,207 |  |
Net Income (Loss) Available to Common Stockholders, Basic, Total | 855 |  | $ 235 | 1,772 | $ 227 |
Retained Earnings (Accumulated Deficit), Ending Balance | 8,596 |  |  | 8,596 |  | $ 6,824
Subsidiaries [Member] |  |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | $ 17,430 |  |  | $ 17,430 |  | $ 16,683
Minimum [Member] |  |  |  |  |  |
Trade Accounts Receivable, Credit Term (Day) |  |  |  | 30 days |  |
Maximum [Member] |  |  |  |  |  |
Trade Accounts Receivable, Credit Term (Day) |  |  |  | 90 days |  |
Trio-Tech (Tianjin) Co., Ltd, [Member] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% |  |  | 100.00% |  |

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