Note 6 - Loss Per Share (Details Textual) - $ / shares			9 Months Ended
		Jan. 06, 2020	Mar. 31, 2020	Jun. 30, 2019
Options and Warrants Outstanding (in shares)			100,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	[1]		100,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	[1]		$ 14.50
President and CEO [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)		100,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)		$ 14.50

[1] The fair value of each option is estimated as of the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions: (i) risk-free interest rate of 1.56%; (ii) expected life of 3.3 years; (iii) expected volatility of 74%; and (iv) expected dividend yield of 0%. The weighted average fair value per share for the options granted is $7.42