Note 1 - Significant Accounting Policies (Details) - Activity of Allowance for Doubtful Accounts (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
Activity of Allowance for Doubtful Accounts [Abstract]
Balance at beginning of year	$ 399	$ 452	$ 509
Net charge to expense	96	4	67
Net charge-off	(41)	(57)	(124)
Balance at end of year	$ 454	$ 399	$ 452