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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, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Weighted average shares outstanding-basic (in shares) 6,597,643 6,751,026 6,634,496 6,846,707
Dilutive options and restricted stock (in shares) 342,481 252,363 335,352 240,723
Weighted average shares outstanding-diluted (in shares) 6,940,124 7,003,389 6,969,848 7,087,430
Share-based Payment Arrangement, Option [Member]        
Antidilutive securities (in shares) 200,000 120,000 83,333 80,000
Restricted Stock [Member]        
Antidilutive securities (in shares) 4,224 3,408