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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Detail) (USD $)	Jun. 30, 2013	Sep. 30, 2012
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

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