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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