Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments In And Advances To Affiliates [Line Items]
Beginning Value	$ 19,363,957
Change in Unrealized Appreciation (Depreciation)	5,374	$ (386)	$ (2,412)
Ending Value	21,895,656	19,363,957
Affiliated Investments [Member]
Investments In And Advances To Affiliates [Line Items]
Beginning Value		4,970,177	6,356,398
Purchases at Cost			44,503,897
Proceeds from Sales			(45,890,118)
Ending Value			4,970,177
Dividend Income			25,575
Affiliated Investments [Member] \| Invesco Government & Agency Portfolio, Institutional Class [Member] \| Money Market Mutual Fund [Member]
Investments In And Advances To Affiliates [Line Items]
Beginning Value	19,363,957	4,970,177
Purchases at Cost	47,747,932	43,697,521	10,375,900
Proceeds from Sales	(45,216,233)	(29,303,741)	(5,405,723)
Ending Value	21,895,656	19,363,957	4,970,177
Dividend Income	$ 346,973	$ 3,564	256
Affiliated Investments [Member] \| Invesco Premier U.S. Government Money Portfolio, Institutional Class \| Money Market Mutual Fund [Member]
Investments In And Advances To Affiliates [Line Items]
Beginning Value			6,356,398
Purchases at Cost			34,127,997
Proceeds from Sales			(40,484,395)
Dividend Income			$ 25,319

Value of the investment at close of period. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(3))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611322-123010

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(2))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611322-123010

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column E))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611322-123010

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Gross additions to the investment in and advance to the affiliate.

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At the close of the period, the dividends or interest included in caption 1 of the statement of operations. In addition, show as the final item the aggregate of dividends and interest included in the statement of operations in respect of investments in affiliates not held at the close of the period. The total of this column would be expected to agree with the correlative amount shown on the related statement of operations.

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Amount of unrealized gain (loss) on investment in marketable security.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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