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

6 Months Ended

Oct. 31, 2014

Notes Tables

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

			Weighted
	Number of		average option
	option shares		exercise price
Outstanding at April 30, 2014		712,024	$	36.73
Granted		—		—
Exercised		147,050		40.54
Forfeited		—		—
Outstanding at October 31, 2014		564,974	$	35.73

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

Unvested at April 30, 2014	148,546
Granted	91,000
Vested	(38,198	)
Forfeited	(8,086	)
Unvested at October 31, 2014	193,262