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Marketable Securities | 12 Months Ended
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Apr. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 8. Marketable Securities 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 |
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 | )
The Company regularly reviews its investment portfolio to identify and evaluate investments that have indications of possible impairment. The Company does not believe that its investments in marketable securities with unrealized losses at April 30, 2020 were other-than-temporary due to market volatility of the security’s fair value, analysts’ expectations and the Company’s ability to hold the securities for a period of time sufficient to allow for any anticipated recoveries in market value. 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 | ) |  | $ | - |
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 |
The fair value accounting framework provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The levels of the fair value hierarchy are described below:
| Level 1 | Inputs to the valuation methodology are unadjusted quoted prices for identical assets or liabilities in active markets that the Company has the ability to access.
| Level 2 | Inputs to the valuation methodology include: -Quoted prices for similar assets or liabilities in active markets; -Quoted prices for identical or similar assets or liabilities in inactive markets; -Inputs other than quoted prices that are observable for the asset or liability; and -Inputs that are derived principally from or corroborated by observable market data by correlation or other means.
| Level 3 | Inputs to the valuation methodology are unobservable and significant to the fair value measurement.
The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs. The Company’s money market, business account, and U.S. securities are valued on a Level 1 basis. The Company’s fixed income corporate debt securities and certificates of deposit are valued on a Level 2 basis.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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