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Investments in Affiliates -Summary of Transactions in, and Earnings from, Investments in Affiliates (Excluding Affiliated Money Market Fund (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investments in and Advances to Affiliates [Line Items]        
Beginning Value     $ 102,216,801  
Change in Unrealized Appreciation (Depreciation) $ (41,398) $ (111,114) 60,905 $ (46,815)
Ending Value 97,059,147   97,059,147  
Affiliated Investments [Member]        
Investments in and Advances to Affiliates [Line Items]        
Beginning Value     102,216,801  
Ending Value 97,059,147   97,059,147  
Affiliated Investments [Member] | Exchange-Traded Fund [Member]        
Investments in and Advances to Affiliates [Line Items]        
Beginning Value 79,935,415 80,325,270 79,818,080 [1] 79,689,390
Change in Unrealized Appreciation (Depreciation) (15,140) (499,620) 102,195 136,260
Ending Value 79,920,275 [1] 79,825,650 79,920,275 [1] 79,825,650
Dividend Income $ 441,467 $ 889,134 $ 1,381,607 $ 889,134
[1] Affiliated company. The security and the Fund are affiliated by having the same investment adviser. See Note 8.