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Note 3 – Fair Value Measurements (Tables) | 6 Months Ended
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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 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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