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Note H - Weighted Average Shares Outstanding - Weighted Average Shares of Common Stock Outstanding (Details) - shares
3 Months Ended 9 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Weighted average shares outstanding-basic (in shares) 6,487,310 6,634,125 6,540,450 6,631,450
Dilutive options and restricted stock (in shares) 292,331 332,063 339,833 307,714
Weighted average shares outstanding-diluted (in shares) 6,779,641 6,966,188 6,880,283 6,939,164
Share-based Payment Arrangement, Option [Member]        
Antidilutive securities (in shares) 205,000 160,000 86,667 203,333
Restricted Stock [Member]        
Antidilutive securities (in shares) 4,000 5,690 2,667 3,305