Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Sep. 30, 2018

Notes Tables

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

	Three Months Ended September 30, 2018				Three Months Ended September 30, 201 7
	Revenue				Revenue
Fund
USO	$	1,984,921	47	%	$	2,943,844	57	%
USCI		1,253,859	30	%		978,617	19	%
UNG		504,862	12	%		697,856	14	%
All Others		479,342	11	%		537,631	10	%
Total	$	4,222,984	100	%	$	5,157,948	100	%

	September 30, 2018				June 30, 2018
	Accounts Receivable				Accounts Receivable
Fund
USO	$	620,792	47	%	$	674,535	46	%
USCI		389,695	30	%		431,288	30	%
UNG		150,863	11	%		182,399	12	%
All Others		160,460	12	%		169,937	12	%
Total	$	1,321,810	100	%	$	1,458,159	100	%

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

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

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

	ASU 2016-01			ASC 606			Total
Increase (decrease):
Assets	$	-		$	-	$	-
Liabilities	$	-		$	-	$	-
Accumulated other comprehensive income	$	(279,951	)	$	-	$	(279,951	)
Retained earnings	$	279,951		$	-	$	279,951