Consolidated Balance Sheets (Unaudited) (Parentheticals) - $ / shares	Jan. 27, 2018	Apr. 29, 2017
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	50,641,234	50,616,134
Series C Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares issued (in shares)	150,000	150,000
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Treasury stock, shares (in shares)	150,000	150,000
Treasury Stock, Common [Member]
Treasury stock, shares (in shares)	4,032,544	4,032,544