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Note 2 - Acquisitions (Tables)
3 Months Ended
Sep. 30, 2018
Notes Tables  
Business Combination, Acquisition Related Costs [Table Text Block]
   
Three Months Ended
 
   
September 30,
 
   
2018
   
2017
 
Deferred compensation arrangements
  $
667
    $
703
 
Acquisition-related costs
   
21
     
302
 
Total
  $
688
    $
1,005
 
Piazza Rosa Group [Member]  
Notes Tables  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
   
Preliminary
Allocation
   
 
Adjustments
   
Final
Allocation
 
   
September 30,
2017
   
 
 
 
 
September 30,
2018
 
Fair value of business combination:
                       
Total cash consideration
  $
10,056
    $
-
    $
10,056
 
Fair value of contingent consideration
   
-
     
2,617
     
2,617
 
Total
  $
10,056
    $
2,617
    $
12,673
 
                         
Identifiable assets acquired and liabilities assumed:                        
Other acquired assets
  $
2,678
    $
1,664
    $
4,342
 
Inventories
   
637
     
(2
)    
635
 
Property, plant, and equipment
   
5,005
     
558
     
5,563
 
Identifiable intangible assets
   
4,087
     
(615
)    
3,472
 
Goodwill
   
6,218
     
858
     
7,076
 
Liabilities assumed
   
(7,387
)    
-
     
(7,387
)
Deferred taxes
   
(1,182
)    
154
     
(1,028
)
Total
  $
10,056
    $
2,617
    $
12,673
 
Tenibac-Graphion, Inc. [Member]  
Notes Tables  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
   
Preliminary Allocation
 
   
At September 30, 2018
 
Fair value of business combination:
       
Cash payments
  $
57,284
 
Less cash acquired
   
(558
)
Total
  $
56,726
 
         
Identifiable assets acquired and liabilities assumed:
       
Other acquired assets
  $
5,023
 
Inventories
   
324
 
Customer backlog
   
1,000
 
Property, plant, and equipment
   
2,490
 
Identifiable intangible assets
   
15,960
 
Goodwill
   
32,949
 
Liabilities assumed
   
(1,020
)
Total
  $
56,726
 
Agile Magnetics [Member]  
Notes Tables  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
   
Preliminary Allocation
 
   
At September 30, 2018
 
Fair value of business combination:
       
Cash payments
  $
39,194
 
Less, cash acquired    
(1
)
Total   $
39,193
 
         
Identifiable assets acquired and liabilities assumed:        
Other acquired assets
  $
1,928
 
Inventories
   
2,506
 
Property, plant, and equipment
   
1,318
 
Identifiable intangible assets
   
13,718
 
Goodwill
   
20,142
 
Liabilities assumed
   
(419
)
Total
  $
39,193