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Note 5 - Loss Per Share (Details Textual) - shares
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 100,000 100,000
Class of Warrant or Right, Outstanding (in shares) 0 0
Share-based Payment Arrangement, Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 100,000