Consolidated Balance Sheets (Parentheticals) - $ / shares	Jun. 30, 2020	Jun. 30, 2019
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	7,000,000	7,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	68,897,779	67,388,047
Common stock, shares outstanding (in shares)	68,897,779	67,388,047
Series B Preferred Stock [Member]
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	59,065	59,065
Preferred stock, shares outstanding (in shares)	59,065	59,065