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Fair Value Measurements - ISG (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 23, 2021 USD ($) | Apr. 30, 2022 USD ($) | Apr. 30, 2022 EUR (€) | Apr. 30, 2022 EUR (€) | Apr. 30, 2021 USD ($)
Intelligent Systems Group |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Fair value of the contingently returnable consideration |  |  |  |  | $ 479,000
Total | $ 29,700,000 |  |  |  |
Contingent consideration paid | 6,000,000 | $ 6,000,000 |  |  |
Fair value of contingent consideration |  | $ 5,857,000 |  |  |
Additional cash consideration | $ 35,371,000 |  |  |  |
Period to obtain target |  | 3 years | 3 years |  |
Intelligent Systems Group | Maximum |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Total |  | $ 6,000,000 |  |  |
Intelligent Systems Group | Business Combination, Specific Revenue Targets Achieved In First Earnout Year |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Released from escrow |  | 2,000,000 |  |  |
Intelligent Systems Group | Business Combination, Specific Revenue Targets Achieved In Second Earnout Year |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Released from escrow |  | 2,000,000 |  |  |
Telerob |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Additional cash consideration |  | $ 7,272,000 | € 6,000,000 |  |
Period to obtain target |  | 36 months | 36 months |  |
Amount of earnout amount not achieved | € |  |  |  | € 2,000,000 |

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