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Repurchase of common stock - Narrative (Details) - USD ($) | Sep. 30, 2021 | May 08, 2019
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Equity [Abstract] |  |
Amount authorized under share repurchase program |  | $ 25,000,000
Remaining authorized repurchase amount | $ 17,100,000 |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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