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Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Dividends Payable [Line Items]
Amount of Dividend	$ 0.24us-gaap_CommonStockDividendsPerShareCashPaid	$ 2.46us-gaap_CommonStockDividendsPerShareCashPaid
May 7, 2013
Dividends Payable [Line Items]
Amount of Dividend	$ 0.12us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = nick_DateDeclaredMay72013Member
Date Declared	May 07, 2013
Record Date	Jun. 21, 2013
Date Paid	Jun. 28, 2013
August 13, 2013
Dividends Payable [Line Items]
Amount of Dividend	$ 0.12us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = nick_DateDeclaredAugust132013Member
Date Declared	Aug. 13, 2013
Record Date	Sep. 20, 2013
Date Paid	Sep. 27, 2013
May 2, 2012
Dividends Payable [Line Items]
Amount of Dividend		$ 0.10us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = nick_DateDeclaredMay22012Member
Date Declared		May 02, 2012
Record Date		May 30, 2012
Date Paid		Jun. 06, 2012
August 8, 2012
Dividends Payable [Line Items]
Amount of Dividend		$ 0.12us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = nick_DateDeclaredAugust82012Member
Date Declared		Aug. 08, 2012
Record Date		Aug. 30, 2012
Date Paid		Sep. 06, 2012
November 9, 2012
Dividends Payable [Line Items]
Amount of Dividend		$ 0.12us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = nick_DateDeclaredNovember92012Member
Date Declared		Nov. 09, 2012
Record Date		Nov. 30, 2012
Date Paid		Dec. 06, 2012
December 11, 2012
Dividends Payable [Line Items]
Amount of Dividend		$ 2.00us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = nick_DateDeclaredDecember112012Member
Date Declared		Dec. 11, 2012
Record Date		Dec. 21, 2012
Date Paid		Dec. 28, 2012
February 19, 2013
Dividends Payable [Line Items]
Amount of Dividend		$ 0.12us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = nick_DateDeclaredFebruary192013Member
Date Declared		Feb. 19, 2013
Record Date		Mar. 22, 2013
Date Paid		Mar. 29, 2013

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

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+ References

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