Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Tables)

9 Months Ended

Jan. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Activity [Table Text Block]

	Number of option shares			Weighted average option exercise price
Outstanding at April 30, 2013		854,809		$	34.64
Granted		---			---
Exercised		(121,435	)		23.98
Forfeited		(2,000	)		44.39
Outstanding at January 31, 2014		731,374		$	36.38

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

Unvested at April 30, 2013	71,196
Granted	91,650
Vested	(14,150	)
Forfeited	(150	)
Unvested at January 31, 2014	148,546