Note 18 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Components of Deferred Tax Assets and Liabilities [Abstract]
Tax losses carried forward	$ 35,683	$ 28,753
Research and development expenses	5,828	5,424
Property, plant and equipment	688	933
Financing expenses	674	1,167
Licenses	118
Tax credit carry forwards	3,331	2,968
Other temporary differences	80	86
Deferred tax assets	46,402
Property, plan and equipment and intangible assets	(20,890)
Deferred tax liabilities	(20,890)
Valuation allowance	(42,401)	(39,331)
Net deferred tax assets	$ 16,889