Significant Accounting Policies - Cash (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Repurchase Agreement Margin	$ 0	$ 300,000
Cash Held by Broker as Margin on Eurodollar Futures Contracts	400,000	$ 500,000
Uninsured Cash	3,800,000
Federal Deposit Insurance Corporation Per Depositor Limit	$ 250,000