XML 45 R31.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Dividends Payable [Line Items] |  |
Amount of Dividend | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid | $ 2.46 us-gaap_CommonStockDividendsPerShareCashPaid
May 7, 2013 |  |
Dividends Payable [Line Items] |  |
Amount of Dividend | $ 0.12 us-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 | $ 0.12 us-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 |  | $ 0.10 us-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 |  | $ 0.12 us-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 |  | $ 0.12 us-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 |  | $ 2.00 us-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 |  | $ 0.12 us-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 + Details
Name: | us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + 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 + Details
Name: | us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + 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 + Details
Name: | us-gaap_DividendsPayableDateDeclaredDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DividendsPayableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DividendsAxis=nick_DateDeclaredAugust132013Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=nick_DateDeclaredAugust82012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=nick_DateDeclaredDecember112012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=nick_DateDeclaredFebruary192013Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=nick_DateDeclaredMay22012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=nick_DateDeclaredMay72013Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=nick_DateDeclaredNovember92012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |