Quarterly report pursuant to Section 13 or 15(d)

Note 3 ??? Marketable Securities (Tables)

v3.22.0.1
Note 3 – Marketable Securities (Tables)
 9 Months Ended
Jan. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
[custom:ScheduleOfAmortizedCostNetUnrealizedGainLossFairValues]
    Amortized Cost   Net Unrealized Gains (Losses)   Fair Value
Money market funds   $ 1,598,428     $ 1,108     $ 1,599,536  
Asset-backed securities     3,113,823       (21,984 )     3,091,839  
Corporate bonds     44,387,966       (633,039 )     43,754,927  
Total   $ 49,100,217     $ (653,915 )   $ 48,446,302  
[custom:ScheduleOfContractualMaturitiesFairValueMeasurements]
    One Year or Less   One to
Five Years		   Over Five Years   Total
Money market funds   $ 1,599,536     $ —       $ —       $ 1,599,536  
Asset-backed securities     —         3,091,839       —         3,091,839  
Corporate bonds     19,808,158       23,366,723       580,046       43,754,927  
Total   $ 21,407,694     $ 26,458,562     $ 580,046     $ 48,446,302  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    Level 1   Level 2   Level 3   Total
Money market funds   $ 1,599,536     $ —       $ —       $ 1,599,536  
Asset-backed securities     —         3,091,839       —         3,091,839  
Corporate bonds     —         43,754,927       —         43,754,927  
Total   $ 1,599,536     $ 46,846,766     $ —       $ 48,446,302