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Marketable Securities (Tables) | 12 Months Ended
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Apr. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | The cost, gross unrealized gains, gross unrealized losses and fair market value of available-for-sale securities at April 30, 2020 and 2019, respectively, were as follows (in thousands):
|  | April 30, 2020 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Fair |
|  |  |  |  |  | Unrealized |  |  | Unrealized |  |  | Market |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Fixed income securities |  | $ | 10,081 |  |  | $ | 495 |  |  | $ | (6 | ) |  | $ | 10,570 |
|  | April 30, 2019 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Fair |
|  |  |  |  |  | Unrealized |  |  | Unrealized |  |  | Market |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Fixed income securities |  | $ | 8,152 |  |  | $ | 71 |  |  | $ | (24 | ) |  | $ | 8,199 |
Unrealized Gain (Loss) on Investments [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 |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
April 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities |  | $ | 380 |  |  | $ | (6 | ) |  | $ | - |  |  | $ | - |  |  | $ | 380 |  |  | $ | (6 | )
April 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities |  | $ | 995 |  |  | $ | (4 | ) |  | $ | 3,349 |  |  | $ | (20 | ) |  | $ | 4,344 |  |  | $ | (24 | )
Realized Gain (Loss) on Investments [Table Text Block] | Proceeds from the sale or redemption of available-for-sale securities and the resulting gross realized gains and losses included in the determination of net loss for the years ended April 30, 2020 and 2019, respectively, were as follows (in thousands):
|  | For the years ended April 30, |
|  | 2020 |  |  | 2019 |
Proceeds |  | $ | 3,539 |  |  | $ | 1,812 |
Gross realized gains |  | $ | - |  |  | $ | 3 |
Gross realized losses |  | $ | (1 | ) |  | $ | - |
Fair Value, by Balance Sheet Grouping [Table Text Block] | Maturities of fixed income securities classified as available-for-sale at April 30, 2020 were as follows (at cost, in thousands):
Current |  | $ | 2,610 |
Due after one year through five years |  |  | 4,280 |
Due after five years through ten years |  |  | 3,191 |
|  | $ | 10,081 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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