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v3.19.2

Variable Interest Entity (Detail Textuals) | 12 Months Ended
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Mar. 31, 2019 USD ($)
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: | num: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