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Fair Value Measurements - (Details) - USD ($) | Apr. 30, 2022 | Apr. 30, 2021
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Intelligent Systems Group |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration | $ (5,857,000) |
Recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 24,716,000 | $ 36,959,000
Contingently returnable consideration | 143,000 | 479,000
Total | 24,859,000 | 37,438,000
Contingent consideration | (1,084,000) |
Total | 1,084,000 |
Recurring basis | Significant other observable inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 24,716,000 | 36,959,000
Total | 24,716,000 | 36,959,000
Recurring basis | Significant unobservable inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingently returnable consideration | 143,000 | 479,000
Total | 143,000 | $ 479,000
Contingent consideration | (1,084,000) |
Total | $ 1,084,000 |

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