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Note 12 - Income Tax Charge / (Credit) - Components of Income Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Statement Line Items [Line Items]      
Current tax $ 2,019 $ 352 $ (1,864)
Deferred tax (11,034) (1,213) 210
TAX CREDIT $ (9,015) $ (861) $ (1,654)