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Consolidated Statements of Income (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Revenue:
Interest and fee income on finance receivables	$ 86,789,958us-gaap_InterestAndFeeIncomeLoansConsumerInstallmentAutomobilesMarineAndOtherVehicles	$ 82,628,943us-gaap_InterestAndFeeIncomeLoansConsumerInstallmentAutomobilesMarineAndOtherVehicles	$ 82,110,446us-gaap_InterestAndFeeIncomeLoansConsumerInstallmentAutomobilesMarineAndOtherVehicles
Expenses:
Marketing	1,562,226us-gaap_MarketingExpense	1,491,216us-gaap_MarketingExpense	1,452,659us-gaap_MarketingExpense
Salaries and employee benefits	20,834,783us-gaap_LaborAndRelatedExpense	19,634,202us-gaap_LaborAndRelatedExpense	18,325,945us-gaap_LaborAndRelatedExpense
Professional fees	1,383,094us-gaap_ProfessionalFees	3,659,429us-gaap_ProfessionalFees	893,044us-gaap_ProfessionalFees
Administrative	9,841,867us-gaap_GeneralAndAdministrativeExpense	8,898,356us-gaap_GeneralAndAdministrativeExpense	8,158,268us-gaap_GeneralAndAdministrativeExpense
Dividend tax		142,557nick_DividendTaxExpense	1,492,227nick_DividendTaxExpense
Provision for credit losses	20,370,530us-gaap_ProvisionForLoanLeaseAndOtherLosses	14,979,216us-gaap_ProvisionForLoanLeaseAndOtherLosses	13,391,875us-gaap_ProvisionForLoanLeaseAndOtherLosses
Depreciation	366,275us-gaap_DepreciationNonproduction	317,504us-gaap_DepreciationNonproduction	284,594us-gaap_DepreciationNonproduction
Interest expense	5,970,434us-gaap_InterestExpense	5,678,188us-gaap_InterestExpense	5,120,827us-gaap_InterestExpense
Change in fair value of interest rate swap agreements	364,378us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1	(688,455)us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1	504,852us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1
Total operating expenses	60,693,587us-gaap_OperatingExpenses	54,112,213us-gaap_OperatingExpenses	49,624,291us-gaap_OperatingExpenses
Operating income before income taxes	26,096,371us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	28,516,730us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	32,486,155us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense	9,240,479us-gaap_IncomeTaxExpenseBenefit	11,813,378us-gaap_IncomeTaxExpenseBenefit	12,545,209us-gaap_IncomeTaxExpenseBenefit
Net income	$ 16,855,892us-gaap_NetIncomeLoss	$ 16,703,352us-gaap_NetIncomeLoss	$ 19,940,946us-gaap_NetIncomeLoss
Earnings per share:
Basic (in dollars per share)	$ 1.40us-gaap_EarningsPerShareBasic	$ 1.38us-gaap_EarningsPerShareBasic	$ 1.66us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 1.38us-gaap_EarningsPerShareDiluted	$ 1.36us-gaap_EarningsPerShareDiluted	$ 1.63us-gaap_EarningsPerShareDiluted
Dividends per share (in dollars per share)		$ 0.24us-gaap_CommonStockDividendsPerShareDeclared	$ 2.46us-gaap_CommonStockDividendsPerShareDeclared

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