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Earnings Per Share (Parentheticals) (Details) - shares shares in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Denominator for Basic earnings per share - weighted-average shares outstanding	7,650	7,758
Basic weighted-average shares outstanding and unvested restricted stock units expected to vest	7,689	7,801
Percentage allocated to shareholders *	99.00%	99.00%

X

- Definition

Basic weighted average number of shares outstanding and unvested restricted stock units expected to vest.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Net income loss allocated to stockholders, percentage.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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X

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256

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