Income Taxes (Detail Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax [Line Items]
Amount of deferred tax asset adjustment		$ 2,400
Change in valuation allowance	$ (248)	(551)	$ 165
Losses carry forward expiration date	Mar. 31, 2020
Accrued interest and penalties	$ 0	0	0
Interest and penalties expenses	$ 0	0	0
Effective federal and state income tax rate	27.32%
Capital Loss Carryforward [Member] | Thailand Income Tax Authority [Member]
Income Tax [Line Items]
Valuation allowance on Deferred income tax assets	$ 0	278	293
Capital Loss Carryforward [Member] | Canada Revenue Agency [Member]
Income Tax [Line Items]
Valuation allowance on Deferred income tax assets	828	798	1,335
Research Tax Credit Carryforward [Member] | Canada Revenue Agency [Member]
Income Tax [Line Items]
Valuation allowance on Deferred income tax assets	$ 0	$ 0	$ 0
Latest Tax Year [Member]
Income Tax [Line Items]
Statutory US federal income tax rate		21.00%
Tax Year 2017 [Member]
Income Tax [Line Items]
Statutory US federal income tax rate		30.75%