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v2.4.1.9

Income Taxes - Summary of components of income tax expense (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Current: |  |  |
Federal | $ 408,056us-gaap_CurrentFederalTaxExpenseBenefit | $ 400,931us-gaap_CurrentFederalTaxExpenseBenefit | $ 448,832us-gaap_CurrentFederalTaxExpenseBenefit
State | 187,266us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 197,671us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 186,616us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current | 595,322us-gaap_CurrentIncomeTaxExpenseBenefit | 598,602us-gaap_CurrentIncomeTaxExpenseBenefit | 635,448us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income (benefits) taxes: |  |  |
Federal | (253,848)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (9,542)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (5,130)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State | (32,822)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 44,795us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 43,489us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred (benefits) taxes | (286,670)us-gaap_DeferredIncomeTaxExpenseBenefit | 35,252us-gaap_DeferredIncomeTaxExpenseBenefit | 38,359us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense | $ 308,652us-gaap_IncomeTaxExpenseBenefit | $ 633,855us-gaap_IncomeTaxExpenseBenefit | $ 673,807us-gaap_IncomeTaxExpenseBenefit

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