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Interest Rate Swap Agreements - Summary of activity in company's notional amounts of interest rate swap agreements (Details) (Interest Rate Swap, USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Interest Rate Swap
Derivatives Fair Value [Roll Forward]
Notional amounts at April 1	$ 50,000,000
New contracts		25,000,000
Matured contracts
Notional amounts at June 30	$ 50,000,000	$ 25,000,000

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Additions of notional amount of interest rate fair value hedge derivatives during period.

+ References

No definition available.

+ Details

Name:	nick_AdditionsOfNotionalAmountOfInterestRateSwaps
Namespace Prefix:	nick_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	nick_DerivativesFairValueRollForward
Namespace Prefix:	nick_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maturities of interest rate fair value hedge derivatives during period.

+ References

No definition available.

+ Details

Name:	nick_MaturitiesOfInterestRateSwapsDerivativesDuringPeriod
Namespace Prefix:	nick_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration