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v3.21.1

Investments (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2020
Minimum [Member] |
Investment In Organization [Line Items] |
Treasury Bills, term | 1 month
Maximum [Member] |
Investment In Organization [Line Items] |
Treasury Bills, term | 5 months

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- Definition Investment In Organization [Line Items] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of Treasury Bills, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | else_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |