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Note 22 - Subsequent Events - Summary of Sales Under Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 26, 2021
Dec. 31, 2020
Dec. 31, 2019
Apr. 28, 2017
Average price per share (in dollars per share)       $ 1.00
Net Proceeds   $ 13,478 $ 0  
The 2020 ATM Offering [Member]        
Total shares of common stock sold (in shares)   16,320,793    
Average price per share (in dollars per share)   $ 0.58    
Gross proceeds   $ 9,264    
Commissions earned by Cantor   278    
Net Proceeds   $ 8,986    
The 2020 ATM Offering [Member] | Subsequent Event [Member]        
Total shares of common stock sold (in shares) 19,120,037      
Average price per share (in dollars per share) $ 1.47      
Gross proceeds $ 28,100      
Commissions earned by Cantor 843      
Net Proceeds $ 27,257