Stock option and bonus plans (Tables)

12 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Stock option summary

	Number			Weighted average exercise
	of options			price
Balance, April 1, 2015		30,000		$	4,50
Expired		(30,000	)	$	4.50
Granted		850,000		$	1.50
Balance, March 31, 2016 and 2017		850,000		$	1.50

Information regarding stock options

		Number		Weighted average		Exercisable
Weighted average		outstanding at		remaining life		shares at
exercise price		March 31, 2017		(years)		March 31, 2017
$	1.50		850,000		5.5		850,000

Schedule of Fair value of Stock Options

	For the Fiscal Year Ended March 31,
	2016			2017
Risk-free interest rate (1)	1.63% to 2.36%				N/A
Expected life (years) (2)	4.71 to 9.71				N/A
Expected dividend yield (3)		0	%		N/A
Volatility (4)		73.63	%		N/A
Fair value of options at grant date per share	$	0.81 to $1.08			N/A

Schedule of Share Based Compensation

	For the Fiscal Year Ended March 31,
	2015		2016		2017
	$ in thousands		$ in thousands		$ in thousands
Administration and general		-		801		-
Total		-		801		-