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Income Taxes - Provision for income taxes (Details) (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
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 7,688,428 us-gaap_CurrentFederalTaxExpenseBenefit | $ 8,709,338 us-gaap_CurrentFederalTaxExpenseBenefit | $ 10,187,010 us-gaap_CurrentFederalTaxExpenseBenefit
State |  |  |  |  |  |  |  |  | 1,196,034 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 1,393,675 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 1,661,860 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current |  |  |  |  |  |  |  |  | 8,884,462 us-gaap_CurrentIncomeTaxExpenseBenefit | 10,103,013 us-gaap_CurrentIncomeTaxExpenseBenefit | 11,848,870 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 308,090 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 1,474,425 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 598,674 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State |  |  |  |  |  |  |  |  | 47,927 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 235,940 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 97,665 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred |  |  |  |  |  |  |  |  | 356,017 us-gaap_DeferredIncomeTaxExpenseBenefit | 1,710,365 us-gaap_DeferredIncomeTaxExpenseBenefit | 696,339 us-gaap_DeferredIncomeTaxExpenseBenefit
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 federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Paragraph Question 1-7 + Details
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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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