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Common stock buyback program and stock options and award plan: (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2025 | Mar. 31, 2025 | Mar. 31, 2024
Common stock buyback program and stock options and award plan |  |  |
Remaining authorized amount for common stock repurchases |  | $ 22.4 |
Purchase of common stock under buyback program (in shares) |  | 0 | 0
Subsequent Events |  |  |
Common stock buyback program and stock options and award plan |  |  |
Purchase of common stock under buyback program (in shares) | 94,856 |  |
Purchase of common stock under buy back program | $ 5.0 |  |
Average share price | $ 53.07 |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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