Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Sep. 30, 2022

Notes Tables

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	For the Three Months Ended				For the Three Months Ended
	September 30, 2022				September 30, 2021
	Revenue				Revenue
Fund
USO	$	2,564,245	47	%	$	3,142,607	56	%
BNO		419,206	8	%		519,919	9	%
UNG		807,940	15	%		427,786	8	%
USCI		597,385	11	%		475,584	8	%
All Others		1,030,659	19	%		1,091,131	19	%
Total	$	5,419,435	100	%	$	5,657,027	100	%

	As of September 30, 2022				As of June 30, 2022
	Accounts Receivable				Accounts Receivable
Fund
USO	$	774,612	47	%	$	1,101,495	49	%
BNO		124,711	7	%		192,208	9	%
UNG		258,997	16	%		249,638	11	%
USCI		184,560	11	%		270,796	12	%
All Others		322,698	19	%		416,737	19	%
Total	$	1,665,578	100	%	$	2,230,874	100	%

Property, Plant and Equipment, Estimated Useful Life [Table Text Block]

Category	Estimated Useful Life (in years)
Building		39
Plant and equipment:		5 to 10
Furniture and office equipment		3 to 5
Vehicles		3 to 5