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Note 13 - Warrants - Summary of Equity-based Warrants (Details) - $ / shares
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Outstanding, number of warrants (in shares) 2,288,528  
Outstanding, weighted average remaining contractual life (Year) 1 year 237 days 2 years
Warrants issued, number of warrants (in shares) 403,760  
Warrants expired, number of warrants (in shares) (842)  
Warrants exercised, number of warrants (in shares)  
Outstanding, number of warrants (in shares) 2,691,446 2,288,528
Weighted Average [Member]    
Outstanding, weighted average exercise price (in dollars per share) $ 30.26  
Outstanding, weighted average exercise price (in dollars per share) $ 26.94 $ 30.26