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Leases (Detail Textuals) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021
Lessee Lease Description [Line Items] |  |
Operating lease, liability | $ 3,410 | $ 3,367
Operating lease, right-of-use asset | $ 3,430 | $ 3,392
Branch network lease agreement |  |
Lessee Lease Description [Line Items] |  |
Operating lease, existence of option to extend | true |
Operating lease minimum term to extend | 1 year |
Operating lease maximum term to extend | 3 years |
Corporate headquarters lease agreement |  |
Lessee Lease Description [Line Items] |  |
Operating lease renewal with lease maturity date | 2023-03 |
Minimum | Branch network lease agreement |  |
Lessee Lease Description [Line Items] |  |
Operating lease, term of contract | 1 year |
Maximum | Branch network lease agreement |  |
Lessee Lease Description [Line Items] |  |
Operating lease, term of contract | 5 years |

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- Definition Lessee operating lease maximum term to extend. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee operating lease minimum term to extend. + References No definition available. + Details
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Namespace Prefix: | nick_
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- Definition Lessee operating lease renewal with lease maturity date. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:gYearMonthItemType
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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