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Related Party Transactions - Additional Information (Detail) (USD $)
12 Months Ended
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