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5. Right of Use Leased Asset (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2019
--- | --- | --- | ---
Right of use asset, gross | $ 2,704,411 | $ 2,257,467 |
Total accumulated amortization |  |  | $ 124,070
Right of use asset, net | 2,373,071 | 1,972,364 | $ 2,153,747
Office Lease [Member] |  |  |
Right of use asset, gross | 2,692,037 | 2,245,093 |
Total accumulated amortization | (320,485) | (274,980) |
Printer Lease [Member] |  |  |
Right of use asset, gross | 12,374 | 12,374 |
Total accumulated amortization | $ (10,855) | $ (10,123) |

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- Definition Amount of lessee's right to use underlying asset under operating lease accumulated amortization + References No definition available. + Details
Name: | gnus_OperatingLeaseRightOfUseAssetAccumulatedAmortization
Namespace Prefix: | gnus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. before amortization + References No definition available. + Details
Name: | gnus_OperatingLeaseRightOfUseAssetGross
Namespace Prefix: | gnus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=gnus_OfficeLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=gnus_PrinterLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |