Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jun. 30, 2020

Notes Tables

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

	Year ended June 30, 2020				Year ended June 30, 2019
	Revenue				Revenue
Fund
USO	$	9,283,250	60	%	$	7,308,354	49	%
USCI		1,645,952	11	%		4,051,605	27	%
UNG		2,244,479	15	%		1,922,596	13	%
All Others		2,285,380	14	%		1,738,884	11	%
Total	$	15,459,061	100	%	$	15,021,439	100	%

	June 30, 2020				June 30, 2019
	Accounts Receivable				Accounts Receivable
Fund
USO	$	1,818,719	70	%	$	526,981	51	%
BNO		265,143	10	%		53,977	5	%
USCI		82,790	3	%		236,251	23	%
UNG		193,218	7	%		141,413	13	%
All Others		251,047	10	%		78,524	8	%
Total	$	2,610,917	100	%	$	1,037,146	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

Accounting Standards Update and Change in Accounting Principle [Table Text Block]

	ASC 842
Increase:
Assets	$	1,113,840
Current portion operating lease liabilities	$	370,697
Long-term operating lease liabilities	$	780,219