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Note 3 - Loss Per Share - Antidilutive Securities (Details) - shares
shares in Thousands
9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Antidilutive securities (in shares) 9,572 7,553
Warrant [Member]    
Antidilutive securities (in shares) 2,646 2,646
Share-Based Payment Arrangement, Option [Member]    
Antidilutive securities (in shares) 6,926 4,907