Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jan. 26, 2013	Apr. 28, 2012
Allowance for trade receivables (in Dollars)	$ 454	$ 399
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	50,361,799	50,321,559
Series C Preferred Stock [Member]
Preferred stock par value (in Dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	150,000	150,000
Treasury Stock, shares	150,000	150,000
Series D Preferred Stock [Member]
Preferred stock par value (in Dollars per share)	$ 1	$ 1
Preferred stock, shares issued	400,000
Preferred stock, aggregate liquidation preference (in Dollars)	$ 20,000
Common Treasury Stock [Member]
Treasury Stock, shares	4,032,784	4,032,784