Note 8 - Summary of Stock Option Activity (Details) - $ / shares		12 Months Ended
		May. 02, 2015	May. 03, 2014	May. 02, 2015
Options outstanding, beginning of year (in shares)		404,355
Options outstanding, beginning of year (in dollars per share)	[1]	$ 6.67
Granted (in shares)		276,800	5,245
Granted (in dollars per share)	[1]	$ 17.84
Exercised (in shares)		(50,220)
Exercised (in dollars per share)	[1]	$ 4.55
Cancelled (in shares)		(17,800)
Cancelled (in dollars per share)	[1]	$ 16.26
Options outstanding, end of year (in shares)		404,355	404,355	613,135
Options outstanding, end of year (in dollars per share)	[1]	$ 6.67	$ 6.67	$ 11.23
Options exercisable, end of year (in shares)		265,437
Options exercisable, end of year (in dollars per share)	[1]	$ 5.93

[1] Weighted average exercise price.