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Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Deferred tax asset:    
Tax losses carryforward $ 2,246 $ 2,376
Revaluation on trading securities 0 2,095
Accrued liabilities 75 35
Valuation allowance (1,538) (3,241)
Deferred tax assets 783 1,265
Deferred tax liabilities:    
Revaluation on trading securities 502 0
Deferred tax liabilities 502 0
Net deferred tax assets $ 281 $ 1,265