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Note 11 - Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
   

Number of
Shares

(in thousands)

   

Weighted

Average
Exercise

Price

   

Weighted

Average

Remaining

Contractual

Life

(in years)

   

Intrinsic

Value

(in thousands)

 

Balance at December 31, 2020

    307     $ 19,577.10       5.95     $  

Options expired

    (4

)

  $ 36,000.00                  

Balance at December 31, 2021

    303     $ 19,360.30       5.02     $  

Balance at December 31, 2022

    303     $ 19,360.30       4.02     $  
                                 

Exercisable at December 31, 2022

    303     $ 19,360.30       4.02     $  
                                 

Vested and expected to vest at December 31, 2022

    303     $ 19,360.30       4.02     $  
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
Options Outstanding     Options Vested  
                Weighted    

Weighted

           

Weighted

 
                Average    

Average

           

Average

 

Exercise

   

Options

   

Remaining

   

Exercise

    Number    

Exercise

 

Price

   

Outstanding

   

Contractual Life

   

Price

    Exercisable    

Price

 
$ 334.00       155       5.44     $ 334.00       155     $ 334.00  
$ 16,400.00 - 28,400.00       31       4.18     $ 17,323.87       31     $ 17,323.87  
$ 36,000.00       103       2.00     $ 36,000.00       103     $ 36,000.00  
$ 103,680.00 - 162,000.00       14       2.85     $ 112,097.14       14     $ 112,097.14  
          303       4.02     $ 19,360.30       303     $ 19,360.30  
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   

Number of

Shares

   

Weighted

Average

Grant Date

Fair Value

   

Weighted

Average

Remaining

Contractual

Term

 

Awards outstanding at December 31, 2020

    20,671     $ 76.03       0.98  

Awarded

    4,500     $ 32.20          

Released

    (13,386

)

  $ 104.31          

Forfeited

    (1,725

)

  $ 53.62          

Awards outstanding at December 31, 2021

    10,060     $ 24.39       0.72  

Released

    (8,590

)

  $ 25.02          

Forfeited

    (1,053

)

  $ 24.25          

Awards outstanding at December 31, 2022

    417     $ 11.64       0.17  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Year Ended December 31,

 
   

2022

   

2021

 

Cost of revenues

  $ 18     $ 101  

Research and development expenses

    37       287  

Selling, general and administrative expenses

    72       627  
    $ 127     $ 1,015