Fair Value Measurements (Details 2) (USD $)	12 Months Ended
	Sep. 30, 2013 item	Sep. 30, 2012
Reconciliation of financial assets measured at fair value on a recurring basis using Level 3 inputs
Carrying value of equity investments in private companies	$ 697,000	$ 697,000
Equity investments
Reconciliation of financial assets measured at fair value on a recurring basis using Level 3 inputs
Fair value at the beginning of the period	5,166,000	2,145,000
Realized (net of fees)	(112,000)	(28,000)
Change in Unrealized Estimated Value	3,821,000	2,887,000
Decrease due to impairment of assets	0	0
Increase due to purchase of shares	0	162,000
Decrease in cost basis due to sale	0	0
Decrease due to transfer from Level 3 to Level 1	0	0
Fair value at the end of the period	$ 8,875,000	$ 5,166,000
Number of privately held companies in which the entity has made equity investments	3
Equity investments | Investment concentration risk
Reconciliation of financial assets measured at fair value on a recurring basis using Level 3 inputs
Number of privately held companies in which the entity has made equity investments	3
Equity investments | Investment concentration risk | Two individual companies
Reconciliation of financial assets measured at fair value on a recurring basis using Level 3 inputs
Concentration risk (as a percent)	99.00%
Number of individual companies in which the entity has investments	2
Equity investments | Investment concentration risk | One individual company
Reconciliation of financial assets measured at fair value on a recurring basis using Level 3 inputs
Concentration risk (as a percent)	93.00%
Number of individual companies in which the entity has investments	1