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Stockholders' equity: Authorized shares (Details) | 12 Months Ended |
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Dec. 31, 2024 Vote / shares $ / shares shares | Dec. 31, 2023 $ / shares shares
Stockholders' equity: |  |
Common stock, shares authorized | shares | 75,000,000 | 75,000,000
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001
Preferred stock, authorized but unissued shares (in shares) | shares | 10,000 |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 |
Voting rights per common share | Vote / shares | 1 |

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