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Investments - Additional Information (Details) (USD $) |  |  | 3 Months Ended |  |  | 12 Months Ended |  |  |
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Jun. 30, 2014 | Jun. 30, 2013 | Mar. 31, 2014 Private and venture capital securities [Member] | Jun. 30, 2014 Offshore fund [Member] | Jun. 30, 2013 Offshore fund [Member] | Jun. 30, 2013 Offshore fund [Member] Significant Other Inputs (Level 2) [Member] Energy and natural resource sectors [Member] | Jun. 30, 2014 Corporate debt securities [Member] | Jun. 30, 2014 Trading Securities [Member] Offshore fund [Member] | Jun. 30, 2014 Trading Securities [Member] Offshore fund [Member] Significant Other Inputs (Level 2) [Member] Energy and natural resource sectors [Member] | Jun. 30, 2013 Trading Securities [Member] Offshore fund [Member] Significant Other Inputs (Level 2) [Member] Energy and natural resource sectors [Member] | Jun. 30, 2013 Available-for-sale Securities [Member] Offshore fund [Member] Significant Other Inputs (Level 2) [Member] Dividend paying equity and debt securities [Member] | Jun. 30, 2013 Available-for-sale Securities [Member] Corporate debt securities [Member] Significant Other Inputs (Level 2) [Member] | Dec. 31, 2013 Government Fund [Member] Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investments held | $ 24,013,000 |  | $ 13,811,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost basis of investments held | 22,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market value of investments to Company's total assets | 63.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other investments | 1,413,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of financial assets derived from Level 1 inputs measured at fair value | 90.00% |  | 58.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of financial assets derived from Level 2 inputs measured at fair value | 9.00% |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of financial assets derived from Level 3 inputs measured at fair value | 1.00% |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading, fair value | 17,817,000 | [1] | 4,758,000 | [1] |  | 998,000 | [1] | 786,000 | [1] | 786,000 |  |  |  | 998,000 | 786,000 |  |  | 14,100,000
Minimum redemption notice |  |  |  |  |  |  |  |  |  |  |  |  | 45 days |  |  |  |  |
Available-for-sale securities, fair value | 6,196,000 | [2],[3] | 9,053,000 | [2],[3] |  |  |  | 4,712,000 | [3] |  | 1,632,000 | [3] |  |  |  | 4,700,000 | 1,100,000 |
Other Investments transferred out of Level 3 assets |  |  |  |  | $ 385,000 |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
[1] | Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.
[2] | Net unrealized gains on available-for-sale securities gross and net of tax as of June 30, 2014, are $1,345 and $888, respectively, and as of June 30, 2013, are $988 and $652, respectively.
[3] | Unrealized gains and losses on available-for-sale securities are excluded from earnings and recorded in other comprehensive income (loss) as a separate component of shareholders’ equity until realized.

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