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Debt Securities | 3 Months Ended
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Oct. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Debt Securities | Note 6—Debt Securities The following is a summary of available-for-sale debt securities:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
October 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit* |  | $ | 7,537 |  |  | $ | 30 |  |  | $ | — |  |  | $ | 7,567 |
U.S. Treasury bills and notes |  |  | 4,179 |  |  |  | — |  |  |  | (8 | ) |  |  | 4,171 |
Corporate bonds |  |  | 6,238 |  |  |  | 14 |  |  |  | (21 | ) |  |  | 6,231 |
Municipal bonds |  |  | 5,923 |  |  |  | — |  |  |  | (2 | ) |  |  | 5,921 |
Total |  | $ | 23,877 |  |  | $ | 44 |  |  | $ | (31 | ) |  | $ | 23,890 |
July 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit* |  | $ | 13,844 |  |  | $ | 58 |  |  | $ | — |  |  | $ | 13,902 |
U.S. Treasury bills |  |  | 2,498 |  |  |  | — |  |  |  | — |  |  |  | 2,498 |
Municipal bonds |  |  | 1,979 |  |  |  | — |  |  |  | (16 | ) |  |  | 1,963 |
Total |  | $ | 18,321 |  |  | $ | 58 |  |  | $ | (16 | ) |  | $ | 18,363 |
| * | Each of the Company’s certificates of deposit has a CUSIP, was purchased in the secondary market through a broker and may be sold in the secondary market.
Proceeds from maturities and sales of debt securities and redemptions of equity investments were $6.6 million and $0.8 million in the three months ended October 31, 2020 and 2019, respectively. There were no realized gains or realized losses from sales of debt securities in the three months ended October 31, 2020 and 2019. The Company uses the specific identification method in computing the realized gains and realized losses on the sales of debt securities. The contractual maturities of the Company’s available-for-sale debt securities at October 31, 2020 were as follows:
|  | Fair Value |
|  | (in thousands) |
Within one year |  | $ | 12,644 |
After one year through five years |  |  | 4,017 |
After five years through ten years |  |  | 5,983 |
After ten years |  |  | 1,246 |
Total |  | $ | 23,890 |
The following available-for-sale debt securities were in an unrealized loss position for which other-than-temporary impairments were not recognized:
|  | Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
October 31, 2020: |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 8 |  |  | $ | 1,673 |
Corporate bonds |  |  | 21 |  |  |  | 3,593 |
Municipal bonds |  |  | 2 |  |  |  | 4,623 |
Total |  | $ | 31 |  |  | $ | 9,889 |
July 31, 2020: |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 16 |  |  | $ | 1,963 |
At October 31, 2020 and July 31, 2020, there were no securities in a continuous unrealized loss position for 12 months or longer.

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