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Note 10 - Segment Information, Significant Customers, Industry Concentration and Geographic Areas (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
  

Year Ended December 31,

 
  

2022

  

2021

  

2020

 
  

(in thousands)

 
  

Amount

  

Percent

  

Amount

  

Percent

  

Amount

  

Percent

 

United States - domestic shipments

 $629,921   66.5  $474,291   67.9  $316,542   66.1 

Shipments to or from Mexico

  313,885   33.2   223,315   32.0   161,412   33.7 

Shipments to or from Canada

  3,056   0.3   891   0.1   1,156   0.2 
                         

Total

 $946,862   100% $698,497   100% $479,110   100%