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Statements of Cash Flows (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net Income (Loss) $ (514,952) $ 720,076
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:    
Cost of securities purchased (27,831,661) (36,725,110)
Proceeds from securities sold and matured 24,994,492 35,999,703
Cost of affiliated investments purchased (26,774,527) (11,463,410)
Proceeds from affiliated investments sold 26,296,950 11,186,481
Net accretion of discount on United States Treasury Obligations (184,601) (135,303)
Net realized (gain) loss on United States Treasury Obligations and Affiliated Investments 56 (16)
Net change in unrealized (gain) loss on United States Treasury Obligations and Affiliated Investments (638) 3,551
Change in operating assets and liabilities:    
Variation margin - Currency Futures Contracts 96,958 243,477
Dividends from affiliates (63) (559)
Management fees 3,199 1,189
Brokerage commissions and fees 1 608
Net cash provided by (used for) operating activities (3,914,786) (169,313)
Cash flows from financing activities:    
Proceeds from purchases of Shares 8,418,328  
Redemption of Shares (4,142,665)  
Increase (decrease) in payable for amount due to custodian, net (360,877)  
Net cash provided by (used for) financing activities 3,914,786  
Net change in cash   (169,313)
Cash at beginning of period 0 169,313
Cash at end of period 0 0
Supplemental disclosure of cash flow information    
Cash paid for interest $ 248 $ 71