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v3.20.4

Subsequent Events (Q3) (Details) | Oct. 21, 2020 shares
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Subsequent Event [Member] | Merger Agreement [Member] |
Subsequent Event [Line Items] |
Converted shares | 97.796467

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- Definition Business Combination, Consideration Transferred, Number of Shares Called By Warrants Or Right. + References No definition available. + Details
Name: | tgc_BusinessCombinationConsiderationTransferredSharesConvertibleRatio
Namespace Prefix: | tgc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=tgc_MergerAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |