Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Impairment of Intangible Assets, Finite-lived	$ 0	$ 3,706
Asset Impairment Charges, Total		1,584
Number of Reportable Segments	1
Assets, Total	$ 128,620	62,458
FRANCE
Assets, Total	$ 157	$ 156

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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+ Details