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Consolidated Schedules of Investments II (Parentheticals)
Jun. 30, 2024
Dec. 31, 2023
[2]
Fidelity Investments Money Market Government Portfolio - Institutional Class [Member]    
Investments interest rate 5.25% [1] 5.29%
Morgan Stanley Liquidity Funds US Dollar Treasury Liquidity Fund - Institutional Class [Member]    
Investments interest rate [1] 5.13%  
[1] 7-day effective yield as of June 30, 2024.
[2] 7-day effective yield as of December 31, 2023.