Note 5 - Goodwill and Intangible Assets (Tables)
 12 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Goodwill [Table Text Block]
 
 
Biological
Indicators
 
 
Instruments
 
 
Cold Chain
Monitoring
 
 
Cold Chain
Packaging
 
 
Total
 
March 31, 2015
   $
12,987
     $
18,235
     $
13,647
     $
--
     $
44,869
  
Effect of foreign currency translation
    
(624
 )    
--
      
--
      
(476
 )    
(1,100
 )
Acquisitions
    
8,535
      
--
      
--
      
13,833
      
22,368
  
March 31, 2016
    
20,898
      
18,235
      
13,647
      
13,357
      
66,137
  
Effect of foreign currency translation
    
(97
 )    
--
      
--
      
(374
 )    
(471
 )
Acquisitions
    
3,218
      
--
      
1,757
      
1,515
      
6,490
  
March 31, 2017
   $
24,019
     $
18,235
     $
15,404
     $
14,498
     $
72,156
  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
(In thousands)
 
March 31, 201
7
 
 
 
Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net
 
 
Useful Life
(Years)
 
Intellectual property
   $
7,210
    $
(3,824
 )   $
3,386
   
10
-
16
  
Trade names
    
3,663
      
(1,727
 )    
1,936
    
 3
-
10
  
Customer relationships
    
52,134
      
(20,260
 )    
31,874
    
 7
-
10
  
Non-compete agreements
    
1,845
      
(1,251
 )    
594
    
 3
-
10
  
    $
64,852
     $
(27,062
 )   $
37,790
    
 
 
 
  
 
 
March 31, 201
6
 
 
 
Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net
 
 
Useful Life
(Years)
 
Intellectual property
   $
7,364
    $
(3,093
 )   $
4,271
   
 10
-
16
  
Trade names
    
3,474
      
(1,271
 )    
2,203
    
 3
-
10
  
Customer relationships
    
48,782
      
(15,228
 )    
33,554
    
 7
-
10
  
Non-compete agreements
    
1,846
      
(1,077
 )    
769
    
 3
-
10
  
    $
61,466
     $
(20,669
 )   $
40,797
    
 
 
 
  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
(In thousands)
        
2018
   $
6,349
 
2019
    
6,021
  
2020
    
5,689
  
2021
    
4,644
  
2022
    
4,278