Statements of Changes in Net Assets (Unaudited) (Parenthetical) - shares	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Creation of shares	3,350,000	10,050,000	15,800,000	12,550,000
Redemption of shares	2,650,000	900,000	15,150,000	3,150,000