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Note 10 - Segment Information (Tables)
3 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
June 30, 2018
 
   
Sterilization
and
Disinfection
Control
   
 
 
 
Instruments
   
 
 
Cold Chain
Monitoring
   
 
 
Cold Chain
Packaging
   
Total
 
Revenues
  $
11,348
    $
8,731
    $
3,223
    $
1,840
    $
25,142
 
                                         
Gross profit
  $
7,812
    $
5,633
    $
1,464
    $
182
     
15,091
 
Reconciling items
(1)
   
 
     
 
     
 
     
 
     
(10,691
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
4,400
 
   
Three Months Ended
June 30, 2017
 
   
Sterilization
and
Disinfection
Control
   
 
 
 
Instruments
   
 
 
Cold Chain
Monitoring
   
 
 
Cold Chain
Packaging
   
Total
 
Revenues
  $
10,183
    $
8,603
    $
2,917
    $
970
    $
22,673
 
                                         
Gross profit
  $
6,720
    $
4,908
    $
894
    $
149
     
12,671
 
Reconciling items
(1)
   
 
     
 
     
 
     
 
     
(11,368
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
1,303
 
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
June 30, 2018
   
March 31,
201
8
 
Total assets:
               
Sterilization and Disinfection Control
  $
76,578
    $
83,452
 
Instruments
   
32,859
     
33,479
 
Cold Chain Monitoring
   
32,132
     
30,796
 
Cold Chain Packaging
   
7,382
     
7,091
 
Corporate and administrative
   
12,507
     
9,283
 
    $
161,458
    $
164,101
 
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Three
M
onths
E
nded
June 30,
 
   
201
8
   
2017
 
United States
  $
15,548
    $
13,011
 
Foreign
   
9,594
     
9,662
 
    $
25,142
    $
22,673