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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Property Plant and Equipment Useful Life [Table Text Block]
  

Years

Computers, software and office equipment

 

3

-

10

Leasehold improvements (1)

 

2

-

5

Manufacturing tooling

 

3

-

7

Laboratory equipment

 

4

-

10

Demo equipment

  

3

 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
 

For the Year Ended December 31,

 

2021

 

2020

 

Stock Options

Expected dividend yield

 

0.0%  

 

0.0% 

Expected stock price volatility

84.8%

-89.6% 

82.6%

-87%

Risk-free interest rate

0.93%

-1.66% 

0.13%

-1.78%

Expected life (years)

 

10  

 

10 
 

Warrants

Expected dividend yield

 

0.0%  

 

0.0% 

Expected stock price volatility

 

84.8% 

82.6%

-87%

Risk-free interest rate

0.42%

-0.69% 

0.135%

-0.79%

Expected life (years)

5/

 5.5 

5/

 5.5