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Summary of Significant Accounting Policies - Income per share (Parentheticals) (Details 1) - shares shares in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Basic weighted-average shares outstanding	7,626	7,702
Basic weighted-average shares outstanding and unvested restricted stock units expected to vest	7,666	7,774
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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X

- Definition

Net income loss allocated to stockholders, percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	nick_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

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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=6371337&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=121326447&loc=d3e1448-109256

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