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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
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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 |  |  |  |  |  |  |  |  | $ 9,133,730 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 9,980,855 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 11,370,154 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of Federal benefit |  |  |  |  |  |  |  |  | 808,574 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,059,249 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,143,692 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Transaction costs |  |  |  |  |  |  |  |  | (733,689)nick_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCost | 733,689 nick_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCost |
Other |  |  |  |  |  |  |  |  | 31,864 us-gaap_IncomeTaxReconciliationOtherAdjustments | 39,585 us-gaap_IncomeTaxReconciliationOtherAdjustments | 31,363 us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense | $ 2,384,462 us-gaap_IncomeTaxExpenseBenefit | $ 2,368,923 us-gaap_IncomeTaxExpenseBenefit | $ 2,665,057 us-gaap_IncomeTaxExpenseBenefit | $ 1,822,037 us-gaap_IncomeTaxExpenseBenefit | $ 2,528,895 us-gaap_IncomeTaxExpenseBenefit | $ 2,833,019 us-gaap_IncomeTaxExpenseBenefit | $ 2,886,484 us-gaap_IncomeTaxExpenseBenefit | $ 3,564,980 us-gaap_IncomeTaxExpenseBenefit | $ 9,240,479 us-gaap_IncomeTaxExpenseBenefit | $ 11,813,378 us-gaap_IncomeTaxExpenseBenefit | $ 12,545,209 us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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