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Stock-Based Compensation: (Tables) | 3 Months Ended
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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

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