21. Subsequent events (Additional Information) (Details Textual) - At-the-market Offering [Member] - USD ($) $ in Thousands			12 Months Ended
	Apr. 01, 2022	Jun. 29, 2020	Mar. 31, 2022	Mar. 31, 2021
Stock Issued During Period, Shares, New Issues (in shares)		0	0	14,700,000
Proceeds from Issuance of Common Stock, Net				$ 59,300
Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	151,575
Proceeds from Issuance of Common Stock, Net	$ 146
Proceeds From Issuance of Common Stock, Gross	$ 151