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Note 4 - Revenue and Segmental Information - Revenue by Geographic Location (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Mar. 31, 2019
Mar. 31, 2018
Statement Line Items [Line Items]        
Revenue $ 13,617 $ 48,710 $ 39,036 $ 33,647
AUSTRALIA        
Statement Line Items [Line Items]        
Revenue 13,507 48,707 37,889 31,985
UNITED STATES        
Statement Line Items [Line Items]        
Revenue 110 1,147 1,662
UNITED KINGDOM        
Statement Line Items [Line Items]        
Revenue $ 3