Significant Accounting Policies (Details)	12 Months Ended
Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)
Segment Analysis [Abstract]
Number of reportable segments \| Segment	1
Minimum [Member]
Depreciation [Abstract]
Estimated useful lives	4 years
Maximum [Member]
Depreciation [Abstract]
Estimated useful lives	7 years
Fair Value, Level 2 [Member]
Fair Value of Financial Instruments [Abstract]
Securities owned	$ 0	$ 0
Fair Value, Level 3 [Member]
Fair Value of Financial Instruments [Abstract]
Securities owned	$ 0	$ 0

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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