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Interest Rate Swap Agreements - Summary of locations and amounts of gains (losses) in income (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Periodic change in fair value of interest rate swap agreements	$ 144,999us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1	$ (98,346)us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1	$ 105,878us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1	$ (681,989)us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1
Periodic settlement differentials included in interest expense	98,517nick_PeriodicSettlementsIncludedInInterestExpense	95,641nick_PeriodicSettlementsIncludedInInterestExpense	297,355nick_PeriodicSettlementsIncludedInInterestExpense	284,680nick_PeriodicSettlementsIncludedInInterestExpense
Total	$ 243,516nick_PreTaxIncomeLossRecognizedInIncome	$ (2,705)nick_PreTaxIncomeLossRecognizedInIncome	$ 403,233nick_PreTaxIncomeLossRecognizedInIncome	$ (397,309)nick_PreTaxIncomeLossRecognizedInIncome

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- Definition

Amount of periodic settlement differentials included in interest expense.

+ References

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- Definition

Represents pre tax income (loss) recognized in income.

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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

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