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Note 4 - Significant Transactions (Details Textual) - GKE Acquisition [Member] - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 16, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Payments to Acquire Businesses, Gross |  | $ 87,187 |
Proceeds from Lines of Credit | $ 71,000 |  |
Business Acquisition, Pro Forma Revenue |  | $ 229,260 | $ 241,360
GKE GmbH and SAL GmbH [Member] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |
Beijing GKE Science & Technology Co. Ltd. [Member] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |

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