Note 2 - Summary of Significant Accounting Policies - Concentration Risk (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenue, related parties	$ 15,459,061	$ 15,021,439
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Wainwright [Member]
Revenue, related parties	$ 15,459,061	$ 15,021,439
Concentration risk percentage	100.00%	100.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Wainwright [Member] | Customers Related to the USO Fund [Member]
Revenue, related parties	$ 9,283,250	$ 7,308,354
Concentration risk percentage	60.00%	49.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Wainwright [Member] | Customers Related to the USCI Fund [Member]
Revenue, related parties	$ 1,645,952	$ 4,051,605
Concentration risk percentage	11.00%	27.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Wainwright [Member] | Customers Related to the UNG Fund [Member]
Revenue, related parties	$ 2,244,479	$ 1,922,596
Concentration risk percentage	15.00%	13.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Wainwright [Member] | All Other Customers [Member]
Revenue, related parties	$ 2,285,380	$ 1,738,884
Concentration risk percentage	14.00%	11.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Wainwright [Member]
Revenue, related parties	$ 2,610,917	$ 1,037,146
Concentration risk percentage	100.00%	100.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Wainwright [Member] | Customers Related to the USO Fund [Member]
Revenue, related parties	$ 1,818,719	$ 526,981
Concentration risk percentage	70.00%	51.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Wainwright [Member] | Customers Related to the USCI Fund [Member]
Revenue, related parties	$ 82,790	$ 236,251
Concentration risk percentage	3.00%	23.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Wainwright [Member] | Customers Related to the BNO Fund [Member]
Revenue, related parties	$ 265,143	$ 53,977
Concentration risk percentage	10.00%	5.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Wainwright [Member] | Customers Related to the UNG Fund [Member]
Revenue, related parties	$ 193,218	$ 141,413
Concentration risk percentage	7.00%	13.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Wainwright [Member] | All Other Customers [Member]
Revenue, related parties	$ 251,047	$ 78,524
Concentration risk percentage	10.00%	8.00%