Note 8 - Stock-based Compensation (Tables)

12 Months Ended

Apr. 30, 2016

Notes Tables

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

	Number of Shares			Price (a)
Options outstanding, beginning of year		613,135		$	11.23
Granted		3,500			9.53
Exercised		(170,715	)		4.97
Cancelled		(27,025	)		15.62
Options outstanding, end of year		418,895			12.44
Options exercisable, end of year		170,056			9.64