Statements of Changes in Shareholders' Equity and Redeemable Capital Shares (Unaudited) - USD ($)	Total	Retained Earnings [Member]	Redeemable Capital Shares [Member]
Balance, Shares at Dec. 31, 2018			1,850,000
Balance at Dec. 31, 2018			$ 175,017,674
Purchases of Shares			$ 9,316,175
Purchases of Shares, Shares			100,000
Redemption of Shares			$ (32,867,039)
Redemption of Shares, Shares			(350,000)
Net Increase (Decrease) due to Share Transactions			$ (23,550,864)
Net Increase (Decrease) due to Share Transactions, Shares			(250,000)
Net Comprehensive Income (Loss)	$ (451,167)	$ (451,167)
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings	$ 451,167	451,167	$ (451,167)
Adjustment of Redeemable Capital Shares to Redemption Value			$ (1,612,200)
Balance, Shares at Mar. 31, 2019			1,600,000
Balance at Mar. 31, 2019			$ 149,403,443
Balance, Shares at Dec. 31, 2019	1,400,000		1,400,000
Balance at Dec. 31, 2019			$ 133,273,946
Purchases of Shares			$ 28,633,994
Purchases of Shares, Shares			300,000
Redemption of Shares			$ (24,046,323)
Redemption of Shares, Shares			(250,000)
Net Increase (Decrease) due to Share Transactions			$ 4,587,671
Net Increase (Decrease) due to Share Transactions, Shares			50,000
Net Comprehensive Income (Loss)	$ (402,408)	(402,408)
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings	$ 402,408	$ 402,408	$ (402,408)
Adjustment of Redeemable Capital Shares to Redemption Value			$ 290,871
Balance, Shares at Mar. 31, 2020	1,450,000		1,450,000
Balance at Mar. 31, 2020			$ 137,750,080