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Stock-Based Compensation: - Stock option activity under the stock option plans (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Number of Shares    
Options outstanding at the beginning 93,681  
Options outstanding at the end 93,681 93,681
Options exercisable at the end 29,681  
Weighted-Average Exercise Price    
Options outstanding at the beginning (in dollars per share) $ 50.28  
Options outstanding at the end (in dollars per share) 50.28 $ 50.28
Options exercisable at the end (in dollars per share) $ 136.94  
Weighted-Average Remaining Contractual Term (Years)    
Options outstanding at the end (in years) 8 years 4 months 24 days 8 years 8 months 12 days
Options exercisable at the end (in years) 6 years 6 months  
Aggregate Intrinsic Value (in thousands)    
Options outstanding at the beginning (in dollars) $ 2,200  
Options outstanding at the end (in dollars) 600 $ 2,200
Options exercisable at the end (in dollars) $ 100