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Interest Rate Swap Agreements (Detail Textuals) - Interest Rate Swap $ in Millions		1 Months Ended
	Jun. 13, 2017 USD ($)	Jul. 30, 2012 USD ($)	Jun. 30, 2017 Contract
Derivatives, Fair Value [Line Items]
Number of interest rate swap agreement matured			1
Derivative notional amount | $	$ 25.0	$ 25.0
Fixed interest rate	1.00%	0.87%
Number of interest rate swap agreements			1
Interest rate swap period		5 years
Description of variable rate basis		1-month LIBOR rate
Interest rate swap agreements, effective date	Jun. 13, 2012	Aug. 13, 2012

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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X

- Definition

The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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X

- Definition

Date the interest rate swap agreement become effective, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	nick_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of interest rate derivative instruments matured by the entity at the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	nick_
Data Type:	xbrli:integerItemType
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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
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X

- 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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X

- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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X

- Details

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