Note 14 - Debt (Details Textual) $ in Thousands	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	May 06, 2021
Debt, Current, Total	$ 72	$ 72
Long-term Debt, Excluding Current Maturities, Total	71	$ 90
Equipment Financing Agreements Assumed In Business Acquisition [Member]
Debt, Current, Total	$ 100
Neeltran Inc. [Member]
Business Combination, Number of Equipment Financing Agreement Assumed			4