Note 7 - Stockholders' Equity - Nonvested Share Activity (Details)	9 Months Ended
	Mar. 31, 2021 $ / shares shares
Nonvested (in shares) | shares
Nonvested, weighted-average grant-date fair value (in dollars per share) | $ / shares
Granted, options (in shares) | shares	960,000
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares	$ 1.06
Vested (in shares) | shares	(960,000)
Vested, weighted-average grant-date fair value (in dollars per share) | $ / shares	$ (1.06)
Nonvested (in shares) | shares
Nonvested, weighted-average grant-date fair value (in dollars per share) | $ / shares