Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Basis of Presentation, Principles of Consolidation, Significant Accounting Policies and Liquidity - Schedule of Fair Value Measurements, Recurring and Nonrecurring (Details)

v3.21.1
Note 2 - Basis of Presentation, Principles of Consolidation, Significant Accounting Policies and Liquidity - Schedule of Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Balance $ 8,192  
Exercise of warrants (52)  
Change in fair value - net (1,577)  
Balance 6,563  
Warrant Liability Long Term [Member]    
Balance 8,192  
Exercise of warrants (52)  
Change in fair value - net (1,577)  
Balance 6,563  
Warrant Liability [Member] | Fair Value, Recurring [Member]    
Fair value of warrant liability 6,563 $ 8,192
Warrant Liability [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value of warrant liability 0 0
Warrant Liability [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value of warrant liability 0 0
Warrant Liability [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value of warrant liability $ 6,563 $ 8,192