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Note 2 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2024
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

For the Year Ended

 
  

December 31,

 
  

2024

  

2023

 

Revenues

 $420  $442 

Less:

        

Cost of revenues

  42   30 

Loss on impairment of goodwill

     60,934 

Depreciation and amortization expense

  2,109   2,075 

Stock-based compensation expense

  54   1,217 

Salaries and benefits expense

  4,192   4,661 

Professional fees

  2,034   5,622 

Research and development expenses

  272   475 

Interest income

  (81)  (347)

Interest expense

  91    

Change in fair value of royalties payable due to related parties

  2,239   (7,208)

Income tax expense

  3,141    

Other segment items (1)

  2,970   3,555 

Segment net loss

  (16,643)  (70,572)
         

Reconciliation of net loss

        

Adjustments and reconciling items

      

Consolidated net loss

  (16,643)  (70,572)
Fair Value, by Balance Sheet Grouping [Table Text Block]
      

December 31, 2024

     
  

Total

  

Level 1

  

Level 2

  

Level 3

 

Assets:

                

Cash Equivalents

                

Mutual fund

 $2,803  $2,803  $  $ 

Money market fund

  12   12       

Total assets

 $2,815  $2,815  $  $ 
                 

Liabilities

                

Royalties payable due to related parties

 $9,213  $  $  $9,213 

Total liabilities

 $9,213  $  $  $9,213 
      

December 31, 2023

     
  

Total

  

Level 1

  

Level 2

  

Level 3

 

Assets:

                

Cash Equivalents

                

Mutual fund

 $3,397  $3,397  $  $ 

Money market fund

  10   10       

Total assets

 $3,407  $3,407  $  $ 
                 

Liabilities

                

Royalties payable due to related parties

 $6,974  $  $  $6,974 

Total liabilities

 $6,974  $  $  $6,974 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

5/22/2020 Raise

  

8/3/2020 Raise

  

Series B

  

Series C

 

Risk-free interest rate

  4.06%  4.06%  3.60%  3.66%

Volatility

  135.35%  132.55%  115.42%  127.65%

Expected dividend yield

  0.00%  0.00%  0.00%  0.00%

Expected life (in years)

  2.4   2.6   6.5   4.5 

Risk-free interest rate

  3.66%

Volatility

  124.07%

Expected dividend yield

  0.00%

Expected life (in years)

  5.0 
  

Series F

  

Series G

 

Risk-free interest rate

  3.8%  3.4%

Volatility

  80.0%  74.0%

Expected dividend yield

  0.0%  0.0%

Expected life (in years)

  2.0   6.0 
Schedule of Property, Plant and Equipment, Useful Life [Table Text Block]

Machinery and equipment

  2 - 5 years 

Computer hardware and software

  1 - 5 years 

LockeT animation video

  3 years 

VIVO DEMO/Clinical Systems

  1-5 years 
Disaggregation of Revenue [Table Text Block]
  

Year Ended December 31,

 
  

2024

  

2023

 

Product Sales

        

US

 $278  $331 

Europe

  142   111 
 
Royalties Payable [Member]  
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
 

December 31, 2024

    

Instrument

Valuation Technique

Unobservable Input

 

Input Range

 

Royalties payable due to related parties

Discounted future cash flows

Revenue adjusted discount rate

  22.5%
       
 

December 31, 2023

    

Instrument

Valuation Technique

Unobservable Input

 

Input Range

 

Royalties payable due to related parties

Discounted future cash flows

Revenue adjusted discount rate

  28.0%
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
 

2024

 

2023

 

Beginning Balance at January 1,

$6,974 $ 

AMIGO royalty payable recognized in connection with the Merger

   160 

LockeT royalty payable recognized in connection with the Merger

   14,022 

Change in fair value of royalties payable due to related parties

 2,239  (7,208)

Ending Balance at December 31,

$9,213 $6,974