Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Mar. 31, 2022

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, 2022				March 31, 2021
	Revenue				Revenue
Fund
USO	$	3,186,393	54	%	$	3,813,588	64	%
BNO		498,603	8	%		663,973	11	%
UNG		534,048	9	%		520,978	9	%
USCI		565,816	10	%		308,497	5	%
All Others		1,083,698	19	%		690,049	11	%
Total	$	5,868,558	100	%	$	5,997,085	100	%

	For the Nine Months Ended				For the Nine Months Ended
	March 31, 2022				March 31, 2021
	Revenue				Revenue
Fund
USO	$	9,304,211	54	%	$	12,909,971	67	%
BNO		1,489,400	9	%		2,060,809	11	%
UNG		1,648,194	9	%		1,664,761	9	%
USCI		1,537,179	9	%		774,913	4	%
All Others		3,247,985	19	%		1,772,347	9	%
Total	$	17,226,969	100	%	$	19,182,801	100	%

	As of March 31, 2022				As of June 30, 2021
	Accounts Receivable				Accounts Receivable
Fund
USO	$	1,309,388	56	%	$	1,156,691	57	%
BNO		200,591	9	%		196,713	10	%
UNG		192,010	8	%		130,543	6	%
USCI		234,738	10	%		141,346	7	%
All Others		409,841	17	%		412,761	20	%
Total	$	2,346,568	100	%	$	2,038,054	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