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Note 12 - Stock-based Compensation Plan (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

 $11  $- 

Selling expense

  7   3 

Engineering and product development expense

  19   10 

General and administrative expense

  335   256 
  $372  $269 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

2022

  

2021

 

Risk-free interest rate

  1.81

%

  1.00

%

Dividend yield

  0.00

%

  0.00

%

Expected common stock market price volatility factor

  .54   .49 

Weighted average expected life of stock options (years)

  6.25   6.25 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
  

Number
of Shares

  

Weighted
Average
Exercise Price

 

Options outstanding, January 1, 2022 (59,195 exercisable)

  408,869   9.07 

Granted

  38,540   9.76 

Exercised

  -   - 

Canceled

  -   - 

Options outstanding, March 31, 2022 (101,670 exercisable)

  447,409   9.13 
Nonvested Restricted Stock Shares Activity [Table Text Block]
  

Number
of Shares

  

Weighted
Average
Grant Date
Fair Value

 

Unvested shares outstanding, January 1, 2022

  262,533   7.16 

Granted

  79,489   10.03 

Vested

  (18,467

)

  9.21 

Forfeited

  -   - 

Unvested shares outstanding, March 31, 2022

  323,555   7.69