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Note P - Share-based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
          

Weighted

      

Weighted

     
      

Weighted

  

Average

      

Average

     
      

Average

  

Share Price

  

Weighted

  

Remaining

  

Aggregate

 
  

Number of

  

Exercise

  

on Date of

  

Average

  

Contractual

  

Intrinsic

 
  

shares

  

Price

  

Exercise

  

Fair Value

  

Life

  

Value

 
  

(in thousands, except price data)

 

Outstanding, January 1, 2021

  276  $10.29      $5.41   2.67  $54 

Exercised

  (2)  6.00  $9.64   0.40       7 

Forfeited

  (4)  10.46       5.64        

Outstanding, December 31, 2021

  270   10.32       5.44   1.69    

Exercisable, December 31, 2021

  270   10.32       5.44   1.69    

Vested and expected to vest

  270   10.32       5.44   1.69    
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
      

Weighted

         
      

Average Share

  

Weighted

  

Aggregate

 
  

Number of

  

Price on Date

  

Average Fair

  

Intrinsic

 
  

shares

  

of Release

  

Value

  

Value

 
  

(in thousands, except price data)

 

Outstanding at January 1, 2021

  1,325      $14.97  $11,279 

Granted

  1,733       10.12   16,016 

Released

  (775) $8.28   15.21   6,411 

Cancelled/Forfeited

  (113)      12.28   583 

Outstanding, December 31, 2021

  2,170       11.15   11,156 

Vested and expected to vest

  2,170       11.15   11,156 
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

2021

  

2020

  

2019

 

Cost of goods sold

 $885  $937  $772 

Research and development

  2,173   2,812   2,557 

Sales and marketing

  1,115   1,191   1,070 

General and administrative

  7,948   8,106   7,405 

Total share-based compensation expense

 $12,121  $13,046  $11,804