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Quarterly report pursuant to Section 13 or 15(d)

Revenue - Narrative (Details)

v3.22.0.1
Revenue - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Apr. 30, 2021
Disaggregation of Revenue [Line Items] Ìý Ìý Ìý Ìý Ìý
Deferred revenue $ 6,182,781 Ìý $ 6,182,781 Ìý $ 6,825,014
Recognition of deferred revenue Ìý Ìý $ 5,424,788 Ìý Ìý
Revenue Benchmark | Non-US | Customer Concentration Risk Ìý Ìý Ìý Ìý Ìý
Disaggregation of Revenue [Line Items] Ìý Ìý Ìý Ìý Ìý
Percentage of revenues from students outside the United States 1.00% 1.00% 1.00% 1.00% Ìý