Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Mar. 31, 2023

Notes Tables

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

	For the Three Months Ended				For the Three Months Ended
	March 31, 2023				March 31, 2022
	Revenue				Revenue
Fund
USO	$	1,875,162	37	%	$	3,186,393	54	%
BNO		439,503	9	%		498,603	8	%
UNG		1,307,149	26	%		534,048	9	%
USCI		457,636	9	%		565,816	10	%
All Others		942,948	19	%		1,083,698	19	%
Total	$	5,022,398	100	%	$	5,868,558	100	%

	For the Nine Months Ended				For the Nine Months Ended
	March 31, 2023				March 31, 2022
					Revenue
Fund
USO	$	6,900,591	44	%	$	9,304,211	54	%
BNO		1,333,558	9	%		1,489,400	9	%
UNG		2,864,969	18	%		1,648,194	9	%
USCI		1,598,978	10	%		1,537,179	9	%
All Others		3,009,908	19	%		3,247,985	19	%
Total	$	15,708,004	100	%	$	17,226,969	100	%

	As of March 31, 2023				As of June 30, 2022
	Accounts Receivable				Accounts Receivable
Fund
USO	$	594,541	34	%	$	1,101,495	49	%
BNO		154,245	9	%		192,208	9	%
UNG		538,225	31	%		249,638	11	%
USCI		142,120	8	%		270,796	12	%
All Others		316,028	18	%		416,737	19	%
Total	$	1,745,159	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