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Fair value measurement
 3 Months Ended
Mar. 31, 2026
Fair Value Disclosures [Abstract]  
Fair value measurement
15. Fair value measurement:
The following table provides the valuation hierarchy classification of assets and liabilities that are recorded at fair value and measured on a recurring basis in the combined balance sheets:
March 31, 2026December 31, 2025
Level 1Level 2Level 3Level 1Level 2Level 3
Financial assets:
Investments subject to significant influence$2,512 $— $— $2,189 $— $— 
Other investments1,507 267 — 954 267 — 
Total financial assets$4,019 $267 $— $3,143 $267 $— 
Financial liabilities:     
Total financial liabilities$— $— $— $— $— $— 
There were no movements in level three instruments for the three months ended March 31, 2026.