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Stock option and award plan: Incentive award plan (Details)	12 Months Ended
	Dec. 31, 2025
Employee Stock Option
Stock option and award plan
Vesting period	4 years
Expiration period	10 years
Exercise period of options vested, when an employee is terminated prior to full vesting	90 days
Restricted stock | Minimum
Stock option and award plan
Vesting period	3 years
Restricted stock | Maximum
Stock option and award plan
Vesting period	4 years

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- Definition

Represents the exercise period of vested options, which the employee may elect to exercise, when an employee is terminated prior to full vesting.

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