Trading Activities and Related Risks (Details) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Trading Activities and Related Risks
Cash and cash equivalents	$ 35,435,737	$ 31,854,126
FCMs, interbank market makers and swap counterparties
Trading Activities and Related Risks
Required margin and good faith deposits, low end of the range (as a percent)	5.00%
Required margin and good faith deposits, high end of the range (as a percent)	35.00%
Cash and cash equivalents	$ 35,435,737	$ 31,854,126
Cash deposited with trading counterparties, percent of net asset value	29.97%	19.26%

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant