Quarterly report pursuant to Section 13 or 15(d)

Note 3 ??? Fair Value Measurements (Tables)

v3.21.4
Note 3 – Fair Value Measurements (Tables)
 6 Months Ended
Oct. 31, 2021
Fair Value Disclosures [Abstract]  
[custom:ScheduleOfAmortizedCostNetUnrealizedGainLossFairValues]
    Amortized Cost   Net Unrealized Gains (Losses)   Fair Value
Money market funds   $ 1,598,428     $ 732     $ 1,599,160  
Asset-backed securities     3,444,037       (9,081 )     3,434,956  
Corporate bonds     43,219,180       (130,639 )     43,088,541  
Total   $ 48,261,645     $ (138,988 )   $ 48,122,657  
[custom:ScheduleOfContractualMaturitiesFairValueMeasurements]
    One Year or Less   Over One Year   Over Five Years   Total
Money market funds   $ 1,599,160     $ —       $ —       $ 1,599,160  
Asset-backed securities     —         3,434,956       —         3,434,956  
Corporate bonds     14,575,236       27,911,550       601,755       43,088,541  
Total   $ 16,174,396     $ 31,346,506     $ 601,755     $ 48,122,657  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    Level 1   Level 2   Level 3   Total
Money market funds   $ 1,599,160     $ —       $ —       $ 1,599,160  
Asset-backed securities     —         3,434,956       —         3,434,956  
Corporate bonds     —         43,088,541       —         43,088,541  
Total   $ 1,599,160     $ 46,523,497     $ —       $ 48,122,657