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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 $ 70,408,854us-gaap_PaymentsForRepurchaseOfCommonStock    
Common shares outstanding 7,701,981us-gaap_CommonStockSharesOutstanding   12,220,874us-gaap_CommonStockSharesOutstanding
Tender Offer      
Significant Accounting Policies [Line Items]      
Purchase of common stock   4,700,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ nick_OfferTypeAxis
= nick_TenderOfferMember		  
Payment for common stock   $ 70,409,000us-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   7,701,981us-gaap_CommonStockSharesOutstanding
/ nick_OfferTypeAxis
= nick_TenderOfferMember