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Interest Rate Swap Agreements - Summary of locations and amounts of gains (losses) in income (Details) (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Periodic change in fair value of interest rate swap agreements | $ (364,378)us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1 | $ 688,455 us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1
Periodic settlement differentials included in interest expense | (392,797)nick_PeriodicSettlementsIncludedInInterestExpense | (383,028)nick_PeriodicSettlementsIncludedInInterestExpense
(Loss) gain recognized in income | $ (757,175)nick_PreTaxIncomeLossGainRecognizedInIncome | $ 305,427 nick_PreTaxIncomeLossGainRecognizedInIncome

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- Definition Represents pre tax income (loss) gain recognized in income. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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