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Note 6 - Goodwill (Details Textual) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2023 USD ($)
Number of Reporting Units |  |  |  | 6
Goodwill, Impairment Loss |  |  |  | $ (0)
Engineering Technologies Group [Member] |  |  |  |
Goodwill, Impairment Loss | $ 7,600 |  | $ 7,600 | $ (0)
Procon Operating Units [Member] |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  | $ 200 |  |

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