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Note 13 - Warrant Liability (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Nov. 02, 2021
Dec. 31, 2020
Sep. 30, 2019
Aug. 13, 2019
Class of Warrant or Right, Outstanding (in shares) 44,582 7,082        
The 2019 Domestic Warrants [Member]            
Warrants and Rights Outstanding       $ 4,900 $ 3,100 $ 3,100
Class of Warrant or Right, Outstanding (in shares) 0          
Warrants and Rights Outstanding       4,900 $ 3,100 3,100
The 2019 Foreign Warrants [Member]            
Warrants and Rights Outstanding       4,200   2,000
Class of Warrant or Right, Outstanding (in shares) 0          
Warrants and Rights Outstanding       4,200   2,000
The 2019 Ladenburg Warrants [Member]            
Warrants and Rights Outstanding       200   100
Warrants and Rights Outstanding       $ 200   $ 100
The 2021 Warrants [Member]            
Warrants and Rights Outstanding $ 0 $ 9,600 $ 14,200      
Warrants and Rights Outstanding $ 0 $ 9,600 $ 14,200