XML 87 R58.htm IDEA: XBRL DOCUMENT v2.4.1.9
Income Taxes - Provision for income taxes reflects an effective U.S tax rate, which differs from the corporate tax rate (Details 2) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Income Tax Disclosure [Abstract]                      
Provision for income taxes at Federal statutory rate                 $ 9,133,730us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 9,980,855us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 11,370,154us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from:                      
State income taxes, net of Federal benefit                 808,574us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1,059,249us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1,143,692us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Transaction costs                 (733,689)nick_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCost 733,689nick_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCost  
Other                 31,864us-gaap_IncomeTaxReconciliationOtherAdjustments 39,585us-gaap_IncomeTaxReconciliationOtherAdjustments 31,363us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense $ 2,384,462us-gaap_IncomeTaxExpenseBenefit $ 2,368,923us-gaap_IncomeTaxExpenseBenefit $ 2,665,057us-gaap_IncomeTaxExpenseBenefit $ 1,822,037us-gaap_IncomeTaxExpenseBenefit $ 2,528,895us-gaap_IncomeTaxExpenseBenefit $ 2,833,019us-gaap_IncomeTaxExpenseBenefit $ 2,886,484us-gaap_IncomeTaxExpenseBenefit $ 3,564,980us-gaap_IncomeTaxExpenseBenefit $ 9,240,479us-gaap_IncomeTaxExpenseBenefit $ 11,813,378us-gaap_IncomeTaxExpenseBenefit $ 12,545,209us-gaap_IncomeTaxExpenseBenefit