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Note 6 - Share-based Compensation (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  Three Months Ended March 31, 
  2021  2020 
         

Cost of sales

 $230  $142 

Selling, general, and administrative expense

  467   318 

Total

 $697  $460 
Schedule of Unvested Restricted Stock Units and Performance Share Awards Activity [Table Text Block]
  

Number of

RSUs and

PSAs (1)

  

Weighted-

Average

Grant Date Fair

Value

 
         

Unvested RSUs and PSAs as of December 31, 2020

  129,572  $25.86 

RSUs and PSAs granted

  90,368   33.30 

RSUs and PSAs vested (2)

  (58,809

)

  25.53 

Unvested RSUs and PSAs as of March 31, 2021

  161,131   30.26