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Line of Credit (Detail Textuals) (USD $)
9 Months Ended
Dec. 31, 2014
Mar. 31, 2014
Line of Credit Facility [Line Items]    
Outstanding amount of line of credit facility $ 130,000,000us-gaap_LineOfCredit $ 127,900,000us-gaap_LineOfCredit
Line of credit facility    
Line of Credit Facility [Line Items]    
Maximum amount of line of credit facility 150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Line of credit facility, Basis Spread on Variable Rate 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Line of credit facility, Description of Variable Rate Basis 30-day LIBOR  
Line of credit facility, Floor rate 1.00%nick_LineOfCreditFacilityFloorRate
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Interest rate 4.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
4.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
Outstanding amount of line of credit facility 130,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
127,900,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
Amount available under the line of credit $ 20,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
$ 22,100,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember