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Summary of Significant Accounting Policies (Detail Textuals 1) (USD $) | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 19, 2015 | Mar. 31, 2014
Significant Accounting Policies [Line Items] |  |  |
Payment for common stock | $ 70,408,854 us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Common shares outstanding | 7,701,981 us-gaap_CommonStockSharesOutstanding |  | 12,220,874 us-gaap_CommonStockSharesOutstanding
Tender Offer |  |  |
Significant Accounting Policies [Line Items] |  |  |
Purchase of common stock |  | 4,700,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / nick_OfferTypeAxis = nick_TenderOfferMember |
Payment for common stock |  | $ 70,409,000 us-gaap_PaymentsForRepurchaseOfCommonStock / nick_OfferTypeAxis = nick_TenderOfferMember |
Percentage of aggregate number of common shares purchased |  | 38.00%nick_PercentageOfAggregateNumberOfCommonSharesPurchased / nick_OfferTypeAxis = nick_TenderOfferMember |
Common shares outstanding |  | 7,701,981 us-gaap_CommonStockSharesOutstanding / nick_OfferTypeAxis = nick_TenderOfferMember |

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