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Note 10 - Taxation - Tax Charge (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Mar. 31, 2018
Statement Line Items [Line Items]          
Current tax $ (162,000) $ 53,000   $ (188,000) $ 2,250,000
Deferred tax 70,000 (766,000)   (369,000) 4,008,000
Total income tax for the period Recognized in the Consolidated Statement of Comprehensive Income (92,000) (713,000) $ (353,000) (557,000) 6,258,000
Country of domicile [member]          
Statement Line Items [Line Items]          
Current tax   29,000 (29,000)
Deferred tax (202)   267 (370)
Foreign countries [member]          
Statement Line Items [Line Items]          
Current tax (162,000) 53,000   (217,000) 2,279,000
Deferred tax $ 70,000 $ (564,000)   $ (636,000) $ 4,378,000