Stock Options (Tables)

12 Months Ended

Apr. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Key employee stock option award plan activity table

	Options Outstanding
				Exercise		Weighted
				price		average
	Shares			per share		exercise price
Balance April 30, 2013		280,242			$ 2.44-24.54	$	12.04
Granted		—			—		—
Exercised		—			—		—
Expired		(34,665	)		6.72-24.54		10.41
Balance April 30, 2014		245,577			$ 2.44-19.20	$	12.27
Granted		—			—		—
Exercised		—			—		—
Expired		(119,831	)		6.72-19.20		16.24
Balance April 30, 2015		125,746			$2.44-15.42	$	8.48

Non-employee director stock option award plan activity table

	Options Outstanding
				Exercise		Weighted
				price		average
	Shares			per share		exercise price
Balance April 30, 2013		31,333		$	11.94-24.54	$	15.60
Granted		—			—		—
Exercised		—			—		—
Expired		(12,666	)		15.42-24.54		17.34
Balance April 30, 2014		18,667		$	11.94-15.42	$	14.43
Granted		—			—		—
Exercised		—			—		—
Expired		(18,667	)		11.94-15.42		14.43
Balance April 30, 2015		—		$	—	$	—