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Intangible Assets | 9 Months Ended
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Jan. 31, 2021
Intangible Assets Gross Excluding Goodwill [Abstract] |
Intangible Assets | (5) Intangible Assets: The following table presents a summary of intangible assets as of January 31, 2021 and April 30, 2020 (in thousands):
|  | January 31, 2021 |  |  | April 30, 2020 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accumulated |  |  | Net Carrying |  |  | Carrying |  |  | Accumulated |  |  | Net Carrying |
|  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships |  | $ | 2,580 |  |  | $ | (2,041 | ) |  | $ | 539 |  |  | $ | 2,580 |  |  | $ | (1,932 | ) |  | $ | 648 |
Developed technology |  |  | 200 |  |  |  | (194 | ) |  |  | 6 |  |  |  | 200 |  |  |  | (176 | ) |  |  | 24 |
Patents, trademarks, and trade names |  |  | 8,242 |  |  |  | (5,367 | ) |  |  | 2,875 |  |  |  | 8,140 |  |  |  | (5,091 | ) |  |  | 3,049 |
|  |  | 11,022 |  |  |  | (7,602 | ) |  |  | 3,420 |  |  |  | 10,920 |  |  |  | (7,199 | ) |  |  | 3,721 |
Patents in progress |  |  | 1,016 |  |  |  | — |  |  |  | 1,016 |  |  |  | 654 |  |  |  | — |  |  |  | 654 |
Total definite-lived intangible assets |  | $ | 12,038 |  |  | $ | (7,602 | ) |  | $ | 4,436 |  |  | $ | 11,574 |  |  | $ | (7,199 | ) |  | $ | 4,375 |
We amortize intangible assets with determinable lives over a weighted-average period of approximately five years. The weighted-average periods of amortization by intangible asset class is approximately five years for customer relationships; six years for developed technology; and five years for patents, trademarks, and trade names. Amortization expense, excluding amortization of deferred financing costs, amounted to $135,000 and $86,000 for the three months ended January 31, 2021 and 2020, respectively. Amortization expense, excluding amortization of deferred financing costs, amounted to $403,000 and $413,000 for the nine months ended January 31, 2021 and 2020, respectively. Estimated amortization expense of intangible assets for the remainder of fiscal 2021 and succeeding fiscal years is as follows (in thousands):
Fiscal |  | Amount |
2021 |  | $ | 134 |
2022 |  |  | 495 |
2023 |  |  | 454 |
2024 |  |  | 445 |
2025 |  |  | 434 |
Thereafter |  |  | 1,458 |
Total |  | $ | 3,420 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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- References No definition available. + Details
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