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Note 8 - Stock-based Compensation Expense (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three months ended March 31,

 
  

2022

  

2021

 
         

Cost of revenue

 $16,029  $- 

Engineering, research and development

 $3,941  $- 

Selling and shipping

 $5,246  $- 

General and administrative

 $71,894  $50,373 
         

Total

 $97,110  $50,373 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]

2007 Share Incentive Plan

                        
  

Beginning

  

Granted

  

Exercised

  

Canceled

  

Ending

     
  

Balance

  

During

  

During

  

During

  

Balance

     
  

Outstanding

  

Period

  

Period

  

Period

  

Outstanding

  

Exercisable

 
                         

Number of shares

  220,000   -   -   -   220,000   220,000 

Weighted average exercise price per share

 $12.56   -   -   -  $12.56  $12.56 

2016 Share Incentive Plan

                        
  

Beginning

  

Granted

  

Exercised

  

Canceled

  

Ending

     
  

Balance

  

During

  

During

  

During

  

Balance

     
  

Outstanding

  

Period

  

Period

  

Period

  

Outstanding

  

Exercisable

 
                         

Number of shares

  398,500   12,500   -   (2,500)  408,500   65,000 

Weighted average exercise price per share

 $4.43  $4.60   -  $4.01  $4.43  $5.94 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Stock Price

 $4.60 

Exercise Price

 $4.60 

Dividend yield

  0%

Expected volatility

  68%

Risk-Free interest rate

  1.79%

Expected life (in years)

  6.00 
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
      

Options Outstanding

  

Options Exercisable

 
          

Weighted

  

Weighted

          

Weighted

     
          

Average

  

Average

          

Average

     

Exercise

  

Number

  

Remaining

  

Exercise

  

Intrinsic

  

Number

  

Exercise

  

Intrinsic

 

Price Range

  

Outstanding

  

Contractual

  

Price

  

Value

  

Exercisable

  

Price

  

Value

 
$4.00-7.00   388,500   9.1  $4.25  $116,000   45,000  $5.00  $0 
$7.01-10.00   20,000   6.1  $8.07  $0   20,000  $8.07  $0 
$10.01-12.00   120,000   3.3  $10.52  $0   120,000  $10.52  $0 
$12.01-15.00   100,000   .4  $15.00  $0   100,000  $15.00  $0 
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
      

Weighted

 
  

Shares of

  

Average Grant

 
  

Restricted

  

Date Fair

 
  

Stock Units

  

Value

 

Unvested outstanding at December 31, 2021

  5,500  $4.82 

Granted

  -  $- 

Vested

  (5,500) $4.82 

Forfeited/Cancelled

  -  $- 
         

Unvested outstanding at March 31, 2022

  -  $-