Taxonomy Viewer

Name	OpenOptionContractsWrittenTypeAxis
Namespace	http://fasb.org/us-gaap/2020-01-31
Prefix	us-gaap
Data type	xbrli:stringItemType
Period type	duration
Substitution Group	xbrldt:dimensionItem
Balance	None
Nillable	True
Abstract	True

Text	Lang	Role	Container role
Open Option Contracts Written Type [Axis]	en-US	http://www.xbrl.org/2003/role/label	http://www.xbrl.org/2003/role/link
Open Option Contracts Written Type [Axis] [No Default]	en-US	http://fasb.org/us-gaap/role/label/axisDefault	http://www.xbrl.org/2003/role/link

Name	Relation Type	Role
Open Option Contracts Written Type [Domain] `us-gaap:OpenOptionContractsWrittenTypeDomain`	parent-child	http://fasb.org/us-gaap/role/disclosure/OpenOptionContractsWritten
Open Option Contracts Written Type [Domain] `us-gaap:OpenOptionContractsWrittenTypeDomain`	dimension-default	http://fasb.org/us-gaap/role/disclosure/OpenOptionContractsWritten
Open Option Contracts Written Type [Domain] `us-gaap:OpenOptionContractsWrittenTypeDomain`	dimension-domain	http://fasb.org/us-gaap/role/disclosure/OpenOptionContractsWritten

	Name	Relation Type	Role
	Open Option Contracts Written [Table] `us-gaap:OpenOptionContractsWrittenTable`	parent-child	http://fasb.org/us-gaap/role/disclosure/OpenOptionContractsWritten
	Open Option Contracts Written [Table] `us-gaap:OpenOptionContractsWrittenTable`	hypercube-dimension	http://fasb.org/us-gaap/role/disclosure/OpenOptionContractsWritten