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Note 8 - Preferred Stock and Common Stock Warrants - Allocation of Net Cash Proceeds (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Proceeds from sale of Series C Convertible Preferred Stock   $ 34,500 $ 0
Series B Warrants [Member]      
Net proceeds - Initial Fair Value Allocation $ 1,266    
Per balance sheet upon issuance 1,266    
Convertible Preferred Stock [Member]      
Proceeds from sale of Series C Convertible Preferred Stock 34,500    
Equity issuance costs 61    
Net proceeds - Initial Fair Value Allocation 34,439    
Series B Convertible Preferred Stock [Member]      
Net proceeds - Initial Fair Value Allocation 33,173    
Per balance sheet upon issuance $ 33,173