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Note 11 - Segment Information (Tables)
6 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended September 30, 2019
 
   
Sterilization and Disinfection Control
   
Instruments
   
Cold Chain Monitoring
   
Cold Chain Packaging
   
Total
 
Revenues (1)
  $
12,094
    $
8,960
    $
3,586
    $
896
    $
25,536
 
                                         
Gross profit
  $
8,720
    $
5,545
    $
1,126
    $
85
    $
15,476
 
Reconciling items (2)
   
 
     
 
     
 
     
 
     
(11,812
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
3,664
 
   
Three Months Ended September 30, 2018
 
   
Sterilization and Disinfection Control
   
Instruments
   
Cold Chain Monitoring
   
Cold Chain Packaging
   
Total
 
Revenues (1)
  $
11,582
    $
8,704
    $
2,950
    $
1,629
    $
24,865
 
                                         
Gross profit
  $
7,972
    $
5,354
    $
1,164
    $
87
    $
14,577
 
Reconciling items (2)
   
 
     
 
     
 
     
 
     
(13,271
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
1,306
 
   
Six Months Ended September 30, 2019
     
 
 
   
 
 
   
Sterilization and Disinfection Control
   
Instruments
   
Cold Chain Monitoring
   
Cold Chain Packaging
   
Total
 
Revenues (1)
  $
24,204
    $
18,504
    $
6,903
    $
2,213
    $
51,824
 
Gross profit
  $
17,225
    $
11,608
    $
2,370
    $
412
    $
31,615
 
Reconciling items (2)
   
 
     
 
     
 
     
 
     
(22,591
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
9,024
 
   
Six Months Ended September 30, 2018
 
   
Sterilization and Disinfection Control
   
Instruments
   
Cold Chain Monitoring
   
Cold Chain Packaging
   
Total
 
Revenues (1)
  $
22,930
    $
17,435
    $
6,173
    $
3,469
    $
50,007
 
Gross profit
  $
15,784
    $
10,987
    $
2,628
    $
269
    $
29,668
 
Reconciling items (2)
   
 
     
 
     
 
     
 
     
(23,962
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
5,706
 
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
September 30, 2019
   
March 31, 2019
 
Sterilization and Disinfection Control
  $
73,242
    $
74,230
 
Instruments
   
32,142
     
30,911
 
Cold Chain Monitoring
   
30,510
     
32,179
 
Cold Chain Packaging
   
1,133
     
1,590
 
Corporate and administrative
   
255,438
     
17,857
 
Total
  $
392,465
    $
156,767
 
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Three Months Ended September 30,
   
Six Months Ended September 30,
 
   
2019
   
2018
   
2,019
   
2,018
 
United States
  $
15,006
    $
16,617
    $
30,197
    $
32,165
 
Foreign
   
10,530
     
8,248
     
21,627
     
17,842
 
Total
  $
25,536
    $
24,865
    $
51,824
    $
50,007