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Financial instruments at fair value (Tables)
12 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Fair value of assets

At the end of the accounting period, the fair value of the following assets were as follows:

    March 31, 2019   March 31, 2020
$ in thousands                                
    Level 1   Level 2   Level 3   Total   Level 1   Level 2   Level 3   Total
Equity investments     102       —         —         102       54       —         —         54