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Note 1 - Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 26, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

March 26,

2022

  

December 25,

2021

 

Raw materials and purchased parts

 $90,925  $92,798 

Work in process

  42,417   40,732 

Finished goods

  27,021   27,523 

Total inventories

 $160,363  $161,053 
Property, Plant and Equipment [Table Text Block]
  

March 26,

2022

  

December 25,

2021

 

Land and land improvements

 $7,998  $7,703 

Buildings and building improvements

  30,987   31,711 

Machinery and equipment

  97,883   95,542 
   136,868   134,956 

Less accumulated depreciation and amortization

  (72,956)  (70,999)

Property, plant and equipment, net

 $63,912  $63,957 
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

 
  

March 26,

2022

  

March 27,

2021

 

Cost of sales

 $145  $262 

Research and development

  752   781 

Selling, general and administrative

  2,525   2,480 

Total share-based compensation

  3,422   3,523 

Income tax benefit

  (1,626)  (234)

Total share-based compensation, net

 $1,796  $3,289 
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
  

Three Months Ended

 
  

March 26,

2022

  

March 27,

2021

 

Weighted average common shares

  48,778   43,756 

Effect of dilutive securities

  791   1,726 
   49,569   45,482 
Disaggregation of Revenue [Table Text Block]
  

Three Months Ended

 

Disaggregated Net Sales

 

March 26, 2022

  

March 27, 2021

 

Systems:

        

Semiconductor Test & Inspection

 $117,349  $138,159 

PCB Test

  -   8,620 

Non-systems:

        

Semiconductor Test & Inspection

  80,408   74,247 

PCB Test

  -   4,462 

Total net sales

 $197,757  $225,488 
  

Three Months Ended

 

Disaggregated Net Sales

 

March 26, 2022

  

March 27, 2021

 

China

 $38,653  $54,265 

Philippines

  24,385   33,754 

United States

  23,763   20,059 

Malaysia

  20,116   23,259 

Taiwan

  19,808   32,196 

Rest of the World

  71,032   61,955 

Total net sales

 $197,757  $225,488 
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  Three Months Ended 
  

March 26

2022

  

March 27

2021

 
Semiconductor Test & Inspection        
Customers individually accounting for more than 10% of net sales  one   * 
Percentage of net sales  11%   * 
PCB Test        
Customers individually accounting for more than 10% of net sales  N/A   * 
Percentage of net sales  N/A   *