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Warranty Reserves | 12 Months Ended
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Apr. 30, 2020
Warranty Reserves |
Warranty Reserves | 9. Warranty Reserves ​ Warranty reserve activity is summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | April 30, | ​
​ |  | 2020 |  | 2019 |
​ | ​ | (In thousands) |
Beginning balance | ​ | $ | 1,704 | ​ | $ | 2,090 | ​
Warranty expense | ​ |  | 2,258 | ​ |  | 211 | ​
Changes in estimates related to pre-existing warranties | ​ | ​ | (189) | ​ | ​ | 491 | ​
Warranty costs settled | ​ |  | (1,758) | ​ |  | (1,088) | ​
Ending balance | ​ | $ | 2,015 | ​ | $ | 1,704 | ​
​ ​ During the fiscal year ended April 30, 2019, the Company revised its estimates based on the results of additional engineering studies and recorded incremental warranty reserve charges totaling $491,000 related to the estimated costs to repair a component of certain small UAS that were delivered in prior periods. During the fiscal year ended April 30, 2020, the Company revised its estimates based on the results of additional engineering studies to $302,000. As April 30, 2020 and 2019, the Company had no remaining warranty reserve related to the estimated costs to repair the impacted UAS and $251,000, respectively. As of April 30, 2020 and 2019, the Company incurred total costs related to this warranty of $288,000 and $240,000, respectively.

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- Definition The entire disclosure for standard and extended product warranties and other product guarantee contracts, including a tabular reconciliation of the changes in the guarantor's aggregate product warranty liability for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -URI http://asc.fasb.org/topic&trid=2155896 + Details
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