Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jul. 30, 2022	Apr. 30, 2022
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)	101,712,358	101,712,358
Series C Preferred Stock [Member]
Treasury stock, shares (in shares)	150,000	150,000
Common Stock [Member]
Treasury stock, shares (in shares)	8,374,112	8,374,112