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Note 14 - Segment Information (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

Three Months Ended
September 30,

  

Nine Months Ended
September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Net Revenues:

                

Thermal

 $13,042  $10,724  $36,863  $29,534 

EMS

  8,102   3,719   25,657   9,414 
  $21,144  $14,443  $62,520  $38,948 

Earnings (loss) before income tax expense (benefit):

                

Thermal

 $865  $478  $1,991  $39 

EMS

  2,278   169   7,767   (574

)

Corporate

  (611

)

  (214

)

  (1,592

)

  (242

)

  $2,532  $433  $8,166  $(777

)

Net earnings (loss):

                

Thermal

 $743  $379  $1,706  $26 

EMS

  1,957   218   6,654   (380

)

Corporate

  (525

)

  (139

)

  (1,364

)

  (161

)

  $2,175  $458  $6,996  $(515

)

Revenue from External Customers by Geographic Areas [Table Text Block]
  

Three Months Ended
September 30,

  

Nine Months Ended
September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Net revenues:

                

U.S.

 $6,271  $5,562  $18,650  $16,235 

Foreign

  14,873   8,881   43,870   22,713 
  $21,144  $14,443  $62,520  $38,948 
Long-lived Assets by Geographic Areas [Table Text Block]
  

September 30,
2021

  

December 31,
2020

 

Net property and equipment:

        

U.S.

 $2,200  $2,053 

Foreign

  197   297 
  $2,397  $2,350 
Asset [Member]  
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

September 30,
2021

  

December 31,
2020

 

Identifiable assets:

        

Thermal

 $51,368  $50,782 

EMS

  16,309   9,667 

Corporate

  7,052   1,581 
  $74,729  $62,030