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Stock-Based Compensation: (Tables)
3 Months Ended
Mar. 31, 2026
Stock-Based Compensation:  
Summary of stock option activity under the stock option plans

  ​ ​ ​

  ​ ​ ​

  ​ ​ ​

Weighted-

  ​ ​ ​

Average

Aggregate

Weighted-

Remaining

Intrinsic

Number

Average

Contractual

Value

of

Exercise

Term

(in

Shares

Price

(Years)

thousands)

Options outstanding at January 1, 2026

 

93,681

$

50.28

 

8.7

$

2.2

Options granted

 

$

 

 

Less options forfeited

 

$

 

 

Less options expired/cancelled

 

$

 

 

Less options exercised

 

$

 

 

Options outstanding at March 31, 2026

 

93,681

$

50.28

 

8.4

$

0.6

Options exercisable at March 31, 2026

 

29,681

$

136.94

 

6.5

$

0.1