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Note 10 - Segment Data (Tables)
3 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended June 30, 2019
 
   
Sterilization
and Disinfection
Control
   
Instruments
   
Cold Chain
Monitoring
   
Cold Chain
Packaging
   
Total
 
Revenues (1)
  $
12,110
    $
9,544
    $
3,317
    $
1,317
    $
26,288
 
                                         
Gross profit
  $
8,505
    $
6,063
    $
1,244
    $
327
    $
16,139
 
Reconciling items (2)
   
 
     
 
     
 
     
 
     
(10,779
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
5,360
 
   
Three Months Ended June 30, 2018
 
   
Sterilization
and Disinfection
Control
   
Instruments
   
Cold Chain
Monitoring
   
Cold Chain
Packaging
   
Total
 
Revenues
(1)
  $
11,348
    $
8,731
    $
3,223
    $
1,840
    $
25,142
 
                                         
Gross profit
  $
7,812
    $
5,633
    $
1,464
    $
182
    $
15,091
 
Reconciling items
(2)
   
 
     
 
     
 
     
 
     
(10,691
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
4,400
 
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
June 30, 2019
   
March 31, 2019
 
Sterilization and Disinfection Control   $
76,258
    $
74,230
 
Instruments
   
32,456
     
30,911
 
Cold Chain Monitoring
   
30,727
     
32,179
 
Cold Chain Packaging
   
1,542
     
1,590
 
Corporate and administrative
   
18,688
     
17,857
 
Total
  $
$159,671
    $
$156,767
 
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Three Months Ended June 30,
 
   
2019
   
2018
 
United States
  $
15,191
    $
15,548
 
Foreign
   
11,097
     
9,594
 
Total
  $
26,288
    $
25,142