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Related Party Transactions - Additional Information (Detail) (USD $) | 12 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011
Related Party Transaction [Line Items] |  |  |
Advisory and Performance fees | $ 317,723 | $ 358,275 | $ 1,387,358
USGIF and offshore clients [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Fair Value investment included in Cash and Cash Equivalents and trading securities | 29,700,000 | 32,900,000 |
Dividend income | 113,787 | 117,234 | 238,604
Unrealized gain (losses) on related party securities | (146,544) | 50,480 | 725,512
Meridian Global Gold and Resources Fund Ltd [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Advisory and Performance fees | 145,054 | 211,960 | 1,129,271
Meridian Global Energy and Resources Fund Ltd [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Advisory and Performance fees | 99,663 | 122,182 | 258,087
Fair Value investment included in trading securities | 785,990 |  |
Charlemagne Capital Limited [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Available-for-sale security | 719,550 |  |
Meridian Global Dividend Income Fund Ltd [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Advisory and Performance fees | 73,006 | 24,133 |
Available-for-sale security | $ 4,712,205 |  |

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