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Financial instruments at fair value (Tables)
12 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Fair value of assets
    March 31, 2016     March 31, 2017  
$ in thousands                                                
    Level 1     Level 2     Level 3     Total     Level 1     Level 2     Level 3     Total  
Forward contracts (1)     -       (160 )     -       (160 )     -       -       -       -  
Investment product (2)     -       -       -       -       -       -       -       -  
Equity investment (3)     144       -       -       144       167       -       -       167