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Note 13 - Acquisition (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Consideration paid:    
Cash paid at closing   $
80,000
 
Working capital adjustment    
250
 
Cash from Dielectrics    
(3,272
)
Total consideration   $
76,978
 
         
Purchase price allocation:        
Accounts receivable   $
4,384
 
Inventory    
4,418
 
Other current assets    
122
 
Property, plant and equipment    
4,600
 
Customer list    
22,555
 
Non-compete    
462
 
Trade name and brand    
367
 
Goodwill    
44,516
 
Total identifiable assets   $
81,424
 
Accounts payable    
(1,325
)
Accrued expenses    
(946
)
Deferred revenue    
(2,175
)
Net assets acquired   $
76,978
 
Business Acquisition, Pro Forma Information [Table Text Block]
    Three Months Ended
September 30,
  Nine Months Ended
September 30,
    2018   2018
      (Unaudited)       (Unaudited)  
Sales   $
47,808
    $
142,813
 
Operating income   $
5,885
    $
13,970
 
Net income   $
4,134
    $
9,700
 
Earnings per share:                
Basic   $
0.56
    $
1.32
 
Diluted   $
0.56
    $
1.31