Note 12 - Subsequent Events (Details Textual) - USD ($)				1 Months Ended	9 Months Ended
	May 07, 2020	May 04, 2020	Apr. 24, 2020	May 06, 2020	Mar. 31, 2020	Mar. 31, 2019
Sale of Units, Value					$ 1,159,000	$ 792,365
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)					390,000
Share Price (in dollars per share)					$ 0.60
Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					0.60
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 2
Subsequent Event [Member]
Proceeds from Paycheck Protection Program Under CARES Act	$ 34,800
Proceeds from Economic Injury Disaster Loan Under CARES Act			$ 6,000
Common Stock, Shares with Exercise Prices in Excess of 0.75 Per Share (in shares)		3,744,100
Class of Warrant or Right with Exercise Prices in Excess of 0.75 Per Share (in shares)		6,938,487
Subsequent Event [Member] | Eight Members Management, Administrative and Technical Team [Member] | Exercise Price Range One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)		1,725,000
Share Price (in dollars per share)		$ 0.75
Subsequent Event [Member] | Eight Members Management, Administrative and Technical Team [Member] | Exercise Price Range One [Member] | Minimum [Member]
Options, Exercise Bonus Awarded		50.00%
Subsequent Event [Member] | Eight Members Management, Administrative and Technical Team [Member] | Exercise Price Range One [Member] | Maximum [Member]
Options, Exercise Bonus Awarded		70.00%
Subsequent Event [Member] | Eight Members Management, Administrative and Technical Team [Member] | Exercise Price Range Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)		70,000
Share Price (in dollars per share)		$ 0.60
Subsequent Event [Member] | Three Directors and CEO [Member] | Exercise Price Range One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)		1,250,000
Subsequent Event [Member] | Sale of Units, One [Member]
Shares Issued, Price Per Share (in dollars per share)				$ 0.50
Sale of Units, Value				$ 150,000
Number of Shares Per Unit (in shares)				1
Number of Warrants Per Unit (in shares)				0.5
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 0.75