Commitment period for advances under Credit Facility.

No definition available.

Name:	nick_CommitmentPeriodForAdvancesUnderCreditFacility
Namespace Prefix:	nick_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of funds available under line of credit facility.

+ References

No definition available.

+ Details

Name:	nick_CreditFacilityFundsAvailablePercentage
Namespace Prefix:	nick_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility, termination or prepayment fee, percentage.

+ References

No definition available.

+ Details

Name:	nick_LineOfCreditFacilityTerminationOrPrepaymentFeePercentage
Namespace Prefix:	nick_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=nick_AresCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=nick_WellsFargoCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=nick_DebtInstrumentRedemptionPeriodAfterYearTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=nick_CreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Line of Credit (Detail Textuals) - USD ($)			3 Months Ended
Line of Credit (Detail Textuals) - USD ($)	Jul. 18, 2022	Nov. 05, 2021	Jun. 30, 2022	Mar. 31, 2022
Line Of Credit Facility [Line Items]
Credit facility, available funds, percentage	23.00%
Debt instrument, basis spread on variable rate			17.00%
Aggregate outstanding indebtedness			$ 70,000,000
Ares Credit Facility
Line Of Credit Facility [Line Items]
Aggregate outstanding indebtedness			$ 70,000,000.0	$ 55,000,000.0
Wells Fargo Credit Facility
Line Of Credit Facility [Line Items]
Line of credit facility amount		$ 175,000,000
Commitment period for advances under Credit Facility		3 years
Wells Fargo Credit Facility \| Year One
Line Of Credit Facility [Line Items]
Termination or prepayment fee, percentage		2.00%
Wells Fargo Credit Facility \| Year Two
Line Of Credit Facility [Line Items]
Termination or prepayment fee, percentage		1.00%
Wells Fargo Credit Facility \| Thereafter
Line Of Credit Facility [Line Items]
Termination or prepayment fee, percentage		0.50%
Wells Fargo Credit Facility \| Secured Overnight Financing Rate
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		2.25%
Wells Fargo Credit Facility \| Minimum
Line Of Credit Facility [Line Items]
Credit facility, available funds, percentage		80.00%
Wells Fargo Credit Facility \| Maximum
Line Of Credit Facility [Line Items]
Credit facility, available funds, percentage		85.00%
Wells Fargo Credit Facility \| Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Line of credit facility amount		$ 175,000,000,000