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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Detail) (USD $) | Jun. 30, 2013 | Sep. 30, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | $ 6,515,582 | $ 7,905,227
Short-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | 6,515,582 | 5,819,537
Long-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total |  | 2,085,690
Financial [Member] | Long-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total |  | 1,237,992
Industrial [Member] | Long-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total |  | 426,974
Utility [Member] | Long-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total |  | 420,724
Corporate debt securities [Member] | Financial [Member] | Short-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | 3,829,251 | 1,604,618
Corporate debt securities [Member] | Industrial [Member] | Short-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | 1,530,300 | 2,264,934
Corporate debt securities [Member] | Utility [Member] | Short-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | 406,628 |
Commercial paper [Member] | Financial [Member] | Short-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total |  | 1,197,730
Commercial paper [Member] | Industrial [Member] | Short-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | 749,403 | 348,817
Certificate of deposit [Member] | Financial [Member] | Short-term Investments [Member] | Recurring [Member] | Level-2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total |  | $ 403,438

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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