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Variable Interest Entity (Detail Textuals) - USD ($) | 1 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Jun. 30, 2021
Variable Interest Entity [Abstract] |  |
Monthly servicing fee percent of outstanding financed receivables | 2.50% |
Recourse to assets |  | $ 0

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- Definition Variable interest entity. + References No definition available. + Details
Name: | nick_VariableInterestEntityAbstract
Namespace Prefix: | nick_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Variable interest entity monthly servicing fee percent of outstanding financed receivables. + References No definition available. + Details
Name: | nick_VariableInterestEntityMonthlyServicingFeePercentOfOutstandingFinancedReceivables
Namespace Prefix: | nick_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Variable interest entity recourse to assets. + References No definition available. + Details
Name: | nick_VariableInterestEntityRecourseToAssets
Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant