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Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Narrative) (Details)

v3.19.2
Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Apr. 30, 2019
Cash equivalents Ìý
Cash insured by FDIC 250,000 Ìý 250,000
Amount of cash balance uninsured by FDIC 7,323,630 Ìý 9,359,208
Marketing and promotional costs 2,209,239 $ 2,187,456 Ìý
Long term accounts receivable 4,249,969 Ìý 3,085,243
Restricted cash 452,021 Ìý 448,400
Letter of credit issued by bank 71,932 Ìý Ìý
Right of use lease asset 7,996,585 Ìý
Right of use lease liability $ 7,095,695 Ìý
Employee Stock Option [Member] Ìý Ìý Ìý
Antidilutive securities 3,237,840 3,515,070 Ìý
Warrant [Member] Ìý Ìý Ìý
Antidilutive securities 687,292 650,847 Ìý
Unvested Restricted Stock [Member] Ìý Ìý Ìý
Antidilutive securities 99,803 0 Ìý
Convertible Debt [Member] [Default Label] Ìý Ìý Ìý
Antidilutive securities 4,167 4,167 Ìý
Convertible debt $ 50,000 $ 50,000 Ìý
Sales Revenue, Net [Member] | Non-US [Member] Ìý Ìý Ìý
Percentage of revenues from students outside the United States 1.48% 1.90% Ìý
Letter of Credit [Member] Ìý Ìý Ìý
Restricted cash $ 122,262 Ìý Ìý
Letter of credit issued by bank $ 257,827 Ìý Ìý