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Debt Securities | 3 Months Ended
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Oct. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Debt Securities | Note 6—Debt Securities The following is a summary of available-for-sale debt securities: Schedule of Available-for-sale Securities
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
October 31, 2021: |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit* |  | $ | - |  |  | $ | - |  |  | $ | — |  |  | $ | - |
U.S. Treasury bills and notes |  | $ | 1,663 |  |  | $ | — |  |  | $ | (36 | ) |  | $ | 1,627 |
Corporate bonds |  |  | 6,276 |  |  |  | 33 |  |  |  | (116 | ) |  |  | 6,193 |
Municipal bonds |  |  | 5,814 |  |  |  | — |  |  |  | (1 | ) |  |  | 5,813 |
Total |  | $ | 13,753 |  |  | $ | 33 |  |  | $ | (153 | ) |  | $ | 13,633 |
July 31, 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit* |  | $ | 1,200 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1,203 |
U.S. Treasury bills and notes |  |  | 1,669 |  |  |  | — |  |  |  | (17 | ) |  |  | 1,652 |
Corporate bonds |  |  | 6,327 |  |  |  | 38 |  |  |  | (33 | ) |  |  | 6,332 |
Municipal bonds |  |  | 4,825 |  |  |  | — |  |  |  | — |  |  |  | 4,825 |
Total |  | $ | 14,021 |  |  | $ | 41 |  |  | $ | (50 | ) |  | $ | 14,012 |
* | 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 $3.9 million and $6.6 million in the three months ended October 31, 2021 and 2020, respectively. There were no realized gains or realized losses from sales of debt securities in the three months ended October 31, 2021 and 2020. 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, 2021 were as follows: Schedule of Contractual Maturities of Available-for-sale Debt Securities
|  | Fair Value |
|  | (in thousands) |
Within one year |  | $ | 1,258 |
After one year through five years |  |  | 6,326 |
After five years through ten years |  |  | 5,249 |
After ten years |  |  | 800 |
Total |  | $ | 13,633 |
The following available-for-sale debt securities were in an unrealized loss position for which other-than-temporary impairments were not recognized: Schedule of Available-for-sale Securities, Unrealized Loss Position
|  | Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |  |  |  |
October 31, 2021: |  |  |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 36 |  |  | $ | 1,627 |
Corporate bonds |  |  | 116 |  |  |  | 5,572 |
Municipal bonds |  |  | 1 |  |  |  | 4,569 |
Total |  | $ | 153 |  |  | $ | 11,768 |
July 31, 2021: |  |  |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 17 |  |  | $ | 1,652 |
Corporate bonds |  |  | 33 |  |  |  | 3,293 |
Total |  | $ | 50 |  |  | $ | 4,945 |
At July 31, 2021, there were no securities in a continuous unrealized loss position for 12 months or longer. At October 31, 2021, the following available-for-sale debt securities included in the table above were in a continuous unrealized loss position for 12 months or longer: Schedule of Continuous Unrealized Loss Position for 12 Months or Longer
|  | Unrealized Losses |  | Fair Value |
|  | (in thousands) |
U.S. Treasury bills and notes |  | $ | 36 |  |  | $ | 1,627 |
Corporate bonds |  |  | 44 |  |  |  | 1,219 |
Total |  | $ | 80 |  |  | $ | 2,846 |
At October 31, 2021, the Company did not intend to sell any of the debt securities included in the table above, and it is not more likely than not that the Company will be required to sell any of these securities before recovery of the unrealized losses, which may be at maturity.

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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 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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