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CONTRACTS AND AGREEMENTS - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021 USD ($)
Maximum [Member]
Commission per round turn	$ 8
Minimum [Member]
Commission per round turn	$ 7
Marketing Agreement [Member] \| BNO's assets up to $3 billion [Member]
Fee percentage	0.06%
Marketing Agreement [Member] \| BNO's assets up to $3 billion [Member] \| Maximum [Member]
Base amount for determining fee percentage	$ 3,000,000,000
Marketing Agreement [Member] \| BNO's assets in excess of $3 billion [Member]
Fee percentage	0.04%
Marketing Agreement [Member] \| BNO's assets in excess of $3 billion [Member] \| Maximum [Member]
Fee percentage	10.00%
Marketing Agreement [Member] \| BNO's assets in excess of $3 billion [Member] \| Minimum [Member]
Base amount for determining fee percentage	$ 3,000,000,000