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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Oct. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | The cost, gross unrealized gains, gross unrealized losses, and fair market value of available-for-sale securities at October 31, 2021 and April 30, 2021, respectively, were as follows (in thousands):
|  | October 31, 2021 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Market Value |
Fixed income securities |  | $ | 9,746 |  |  | $ | 313 |  |  | $ | (104 | ) |  | $ | 9,955 |
|  | April 30, 2021 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Market Value |
Fixed income securities |  | $ | 10,022 |  |  | $ | 393 |  |  | $ | (102 | ) |  | $ | 10,313 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] | The following table presents the fair value and unrealized losses, aggregated by investment type and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
|  | Less than 12 months |  |  | 12 Months or more |  |  | Total |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
October 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Income Securities |  | $ | 1,913 |  |  | $ | (22 | ) |  | $ | 1,325 |  |  | $ | (82 | ) |  | $ | 3,238 |  |  | $ | (104 | )
April 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Income Securities |  | $ | 1,793 |  |  | $ | (52 | ) |  | $ | 614 |  |  | $ | (50 | ) |  | $ | 2,407 |  |  | $ | (102 | )
Investments Classified by Contractual Maturity Date [Table Text Block] | Maturities of fixed income securities classified as available-for-sale at October 31, 2021 were as follows, at cost (in thousands):
Current |  | $ | 3,154 |
Due after one year through five years |  |  | 4,154 |
Due after five years |  |  | 2,438 |
|  | $ | 9,746 |

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