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Financial Instruments (Details Textual) - Jun. 30, 2017
CAD in Millions, $ in Millions
USD ($)
CAD
EUR (€)
AUD
Foreign Exchange Contract [Member]        
Financial Instruments [Line Items]        
Investment Owned, Foreign Currency Contract, Current Value     € 208,000 AUD 310,000
Foreign Exchange Contracts, Australian [Member]        
Financial Instruments [Line Items]        
Investment Owned, Foreign Currency Contract, Current Value $ 2.5     AUD 3,200,000
Foreign Exchange Contracts, Canadian [Member]        
Financial Instruments [Line Items]        
Investment Owned, Foreign Currency Contract, Current Value $ 6.8 CAD 9.0