Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jun. 30, 2023

Notes Tables

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

	For the Year Ended				For the Year Ended
	June 30, 2023				June 30, 2022
	Revenue				Revenue
Fund
USO	$	8,684,674	42	%	$	12,634,794	53	%
BNO		1,700,995	8	%		2,074,177	9	%
UNG		4,572,559	22	%		2,380,912	10	%
USCI		1,967,048	9	%		2,266,692	10	%
All Others		3,936,915	19	%		4,478,773	18	%
Total	$	20,862,191	100	%	$	23,835,348	100	%

	As of June 30, 2023				As of June 30, 2022
	Accounts Receivable				Accounts Receivable
Fund
USO	$	596,039	36	%	$	1,101,495	49	%
BNO		108,153	6	%		192,208	9	%
UNG		554,011	33	%		249,638	11	%
USCI		113,634	7	%		270,796	12	%
All Others		302,058	18	%		416,737	19	%
Total	$	1,673,895	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