Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Assets categorized on the basis of various levels
Fair value measurements, Total	$ 8,585
Cash and cash equivalents [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	8,172
Investments in marketable securities [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	6
Investment in the Hennessy Micro Cap Fund [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	407
Money market fund deposits [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	8,172
Mutual fund investments [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	6
Investment in domestic equities [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	407
Level 1 [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	8,178
Level 1 [Member] | Cash and cash equivalents [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	8,172
Level 1 [Member] | Investments in marketable securities [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	6
Level 1 [Member] | Money market fund deposits [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	8,172
Level 1 [Member] | Mutual fund investments [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	6
Level 2 [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	407
Level 2 [Member] | Investment in the Hennessy Micro Cap Fund [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	407
Level 2 [Member] | Investment in domestic equities [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total	407
Level 3 [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total
Level 3 [Member] | Cash and cash equivalents [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total
Level 3 [Member] | Investments in marketable securities [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total
Level 3 [Member] | Investment in the Hennessy Micro Cap Fund [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total
Level 3 [Member] | Money market fund deposits [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total
Level 3 [Member] | Mutual fund investments [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total
Level 3 [Member] | Investment in domestic equities [Member]
Assets categorized on the basis of various levels
Fair value measurements, Total