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Note 8 - Goodwill and Long-lived Assets (Tables)
12 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Goodwill [Table Text Block]
   
Sterilization and Disinfection Control
   
Instruments
   
Biopharmaceutical Development
   
Continuous Monitoring
   
Corporate and Other
   
Total
 
March 31, 2018
  $
30,503
    $
18,235
    $
--
    $
15,404
    $
1,401
    $
65,543
 
Effect of foreign currency translation
   
(723
)    
--
     
--
     
--
     
(67
)    
(790
)
Acquisitions
   
--
     
--
     
--
     
2,699
     
--
     
2,699
 
Impairment
   
--
     
--
     
--
     
--
     
(1,075
)    
(1,075
)
March 31, 2019
   
29,780
     
18,235
     
--
     
18,103
     
259
     
66,377
 
Effect of foreign currency translation
   
(186
)    
(20
)    
(2,447
)    
--
     
(1
)    
(2,654
)
Acquisitions
   
--
     
908
     
77,162
     
--
     
--
     
78,070
 
Impairment
   
--
     
--
     
--
     
--
     
(258
)    
(258
)
March 31, 2020
  $
29,594
    $
19,123
    $
74,716
    $
18,103
    $
--
    $
141,536
 
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
March 31, 2020
   
March 31, 2019
 
   
Gross Carrying Amount
   
Accumulated Amortization
   
Net Carrying Amount
   
Gross Carrying Amount
   
Accumulated Amortization
   
Net Carrying Amount
 
Intellectual property
  $
15,731
    $
(6,454
)   $
9,277
    $
7,690
    $
(5,301
)   $
2,389
 
Trade names
   
5,839
     
(2,855
)    
2,984
     
3,739
     
(2,542
)    
1,197
 
Customer relationships
   
146,106
     
(38,777
)    
107,329
     
61,198
     
(31,584
)    
29,614
 
Non-compete agreements
   
1,447
     
(1,166
)    
281
     
1,581
     
(1,562
)    
19
 
Total
  $
169,123
    $
(49,252
)   $
119,871
    $
74,208
    $
(40,989
)   $
33,219
 
Description
 
Estimated Useful Life (Years)
   
Weighted Average Remaining Life (Years)
 
Intellectual Property
   
10
-
15
     
9.5
 
Trade Name
   
5
-
10
     
4.4
 
Customer Relationships
   
5
-
10
     
9.5
 
Non-compete Agreements
   
5
-
10
     
4.4
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
2021
  $
14,813
 
2022
   
14,448
 
2023
   
14,240
 
2024
   
13,724
 
2025
   
12,129