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Subsequent Event (Details) - Subsequent Event | Mar. 03, 2022 USD ($)
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Executive Chairman of the Board |
Subsequent Event [Line Items] |
Annual base salary, amount | $ 1,097,000
Target annual bonus opportunity, percentage of annual base salary | 100.00%
Signing bonus, amount | $ 1,000,000
Chief Executive Officer |
Subsequent Event [Line Items] |
Annual base salary, amount | $ 640,000
Target annual bonus opportunity, percentage of annual base salary | 90.00%

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Annual Base Salary, Amount + References No definition available. + Details
Name: | wlfc_AnnualBaseSalaryAmount
Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Signing Bonus, Amount + References No definition available. + Details
Name: | wlfc_SigningBonusAmount
Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Target Annual Bonus Opportunity, Percentage Of Annual Base Salary + References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
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: |

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