Commitments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Commitments (Textual)
Outstanding contractual commitments	$ 90	$ 20
Rental expense for operating leases	$ 3,273	$ 3,292	$ 3,348
Maximum [Member]
Commitments (Textual)
Renewal period	5 years
Minimum [Member]
Commitments (Textual)
Renewal period	2 years