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)

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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Balance $ 5,390 $ 8,192  
Change in fair value - net (1,678) (4,428)  
Exercise of warrants   (52)  
Balance 3,712 3,712  
Warrant Liability Long Term [Member]      
Balance 5,390 8,192  
Change in fair value - net (1,678) (4,428)  
Exercise of warrants   (52)  
Balance 3,712 3,712  
Fair Value, Recurring [Member] | Warrant Liability [Member]      
Fair value of warrant liability 3,712 3,712 $ 8,192
Fair Value, Recurring [Member] | Warrant Liability [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of warrant liability 0 0 0
Fair Value, Recurring [Member] | Warrant Liability [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of warrant liability 0 0 0
Fair Value, Recurring [Member] | Warrant Liability [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of warrant liability $ 3,712 $ 3,712 $ 8,192