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Note 11 - Subsequent Event (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Oct. 27, 2022
Oct. 06, 2022
Oct. 31, 2022
Jun. 30, 2021
Apr. 01, 2022
Mar. 31, 2022
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 0.0001 $ 0.0001
Common Stock Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)           4,850,241
Common Stock Warrants 2 [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.7949          
Subsequent Event [Member] | Common Stock Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 45,178,811          
Subsequent Event [Member] | Prefunded Warrant and Common Stock Warrants [Member]            
Class of Warrant or Right, Purchase Price of Warrants or Rights (in dollars per share) $ 0.9198          
Subsequent Event [Member] | Common Stock Warrants 1 [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.7949          
Subsequent Event [Member] | Private Placement [Member]            
Stock Issued During Period, Shares, New Issues (in shares) 45,178,811          
Shares and Warrants Issued, Price Per Share (in dollars per share) $ 0.9199          
Proceeds from Issuance or Sale of Equity, Total $ 41.5          
3D Medicines, Inc [Member]            
Proceeds from Milestone Achievement       $ 6.0    
3D Medicines, Inc [Member] | Subsequent Event [Member]            
Proceeds from Milestone Achievement   $ 6.0 $ 6.0