Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - $ / shares	Jan. 25, 2020	Apr. 27, 2019
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	150,000	150,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	50,754,884	50,678,084
Treasury Stock, Common [Member]
Treasury stock, shares (in shares)	4,139,405	4,032,544
Series C Preferred Stock [Member]
Treasury stock, shares (in shares)	150,000	150,000