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Earnings Per Share (Parentheticals) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Basic weighted-average shares outstanding	7,286	7,273	7,288	7,385
Basic weighted-average shares outstanding and unvested restricted stock units expected to vest	7,287	7,273	7,288	7,385
Percentage allocated to shareholders *	100.00%	100.00%	100.00%	100.00%

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_
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- 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
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482662/260-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482689/260-10-45-10

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