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Note 2 - Acquisitions (Tables)
 6 Months Ended
Dec. 31, 2018
Notes Tables  
Business Combination, Acquisition Related Costs [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
December 31,
    
December 31,
  
   
2018
    
2017
    
2018
    
2017
  
Deferred compensation arrangements
   $
703
     $
703
     $
1,370
     $
1,405
  
Acquisition-related costs
    
156
      
-
      
177
      
303
  
Total
   $
859
     $
703
     $
1,547
     $
1,708
  
Piazza Rosa Group [Member]  
Notes Tables  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
   
Preliminary Allocation
September 30, 2017
    
 
Adjustments
    
Final
Allocation
  
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
September 30, 2018
    
Adjustments
    
Adjusted Allocation
December 31, 2018
  
Fair value of business combination:
                        
Cash payments
   $
57,284
      
 
      
57,824
  
Less cash acquired
    
(558
 )    
 
      
(558
 )
Total
   $
56,726
      
-
      
56,726
  
                         
Identifiable assets acquired and liabilities assumed:
                        
Other acquired assets
   $
5,023
      
(649
 )    
4,374
  
Inventories
    
324
      
 
      
324
  
Customer backlog
    
1,000
      
(800
 )    
200
  
Property, plant, & equipment
    
2,490
      
 
      
2,490
  
Identifiable intangible assets
    
15,960
      
900
      
16,860
  
Goodwill
    
32,949
      
799
      
33,748
  
Liabilities assumed
    
(1,020
 )    
(250
 )    
(1,270
 )
Total
   $
56,726
      
-
      
56,726
  
Agile Magnetics [Member]  
Notes Tables  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
   
Preliminary Allocation
September 30, 2018
    
Adjustments
    
Adjusted Allocation
December 31, 2018
  
Fair value of business combination:
                        
Cash payments
   $
39,194
      
 
      
39,194
  
Less, cash acquired
    
(1
 )    
 
      
(1
 )
Total
   $
39,193
      
 
      
39,193
  
                         
Identifiable assets acquired and liabilities assumed:
                        
Other acquired assets
   $
1,928
      
(35
 )    
1,893
  
Inventories
    
2,506
      
90
      
2,596
  
Customer Backlog
    
-
      
220
      
220
  
Property, plant, & equipment
    
1,318
      
(348
 )    
970
  
Identifiable intangible assets
    
13,718
      
4,432
      
18,150
  
Goodwill
    
20,142
      
(4,351
 )    
15,791
  
Liabilities assumed
    
(419
 )    
(8
 )    
(427
 )
Total
   $
39,193
      
-
      
39,193