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The Company and Significant Accounting Policies (Details)
Sep. 30, 2025
Dec. 31, 2024
Buckskin    
Investment owned, percent of net assets 37.00% 37.00%
NJMJV    
Investment owned, percent of net assets 65.00% 65.00%
Butte Highlands Joint Venture ("BHJV")    
Investment owned, percent of net assets 50.00% 50.00%