v3.25.4
Investments, at Fair Value - Schedule of Investments at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market cash equivalents $ 32,362 $ 7,561
Total investments 76,581 91,467
Total Liabilities (46) (32)
Total investments, at fair value 76,535 91,435
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market cash equivalents 32,362 6,214
Total investments 57,827 70,988
Total Liabilities (46) (32)
Total investments, at fair value 57,781 70,956
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 18,754 20,479
Total investments, at fair value 18,754 20,479
Texas Pacific Land Corporation common stock    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 49,714 63,797
Texas Pacific Land Corporation common stock | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 49,714 63,797
Kinetics Market Opportunities Fund    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 8,024 8,302
Kinetics Market Opportunities Fund | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 8,024 8,302
Kinetics Spin-Off and Corporate Restructuring Fund-Institutional Class    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 2,739 3,598
Kinetics Spin-Off and Corporate Restructuring Fund-Institutional Class | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 2,739 3,598
All Other Market Traded Equity Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 3,454 2,900
All Other Market Traded Equity Securities | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 3,454 2,900
Kinetics Mutual Funds and ETFs    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 2,396 2,419
Kinetics Mutual Funds and ETFs | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 2,396 2,419
Kinetics Global Fund No Load Class    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 2,479 2,416
Kinetics Global Fund No Load Class | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 2,479 2,416
Grayscale Bitcoin Trust    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 2,189 2,370
Grayscale Bitcoin Trust | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 2,189 2,370
CBOE Global Markets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 2,470 1,921
CBOE Global Markets | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 2,470 1,921
FRMO Corporation common stock    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 1,432 1,916
FRMO Corporation common stock | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 1,432 1,916
SPAC Active ETF    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 1,684 1,828
SPAC Active ETF | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments 1,684 1,828
Market Traded Equity Securities - Sold Short    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Liabilities (46) (32)
Market Traded Equity Securities - Sold Short | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Liabilities $ (46) $ (32)