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Note 12 - Segment Information (Tables)
9 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended December 31, 2019
 
   
Sterilization and Disinfection Control
   
Instruments
   
Biopharmaceutical Development
   
Cold Chain Monitoring
   
Cold Chain Packaging
   
Total
 
Revenues (1)
  $
11,619
    $
10,014
    $
5,637
    $
4,156
    $
229
    $
31,655
 
Gross profit (loss)
  $
8,098
    $
6,520
    $
(1,294
)   $
1,371
    $
(18
)   $
14,677
 
Reconciling items (2)
   
 
     
 
     
 
     
 
     
 
     
(19,880
)
Loss before income taxes
   
 
     
 
     
 
     
 
     
 
    $
(5,203
)
   
Three Months Ended December 31, 2018
 
   
Sterilization and Disinfection Control
   
Instruments
   
Biopharmaceutical Development
   
Cold Chain Monitoring
   
Cold Chain Packaging
   
Total
 
Revenues (1)
  $
11,545
    $
9,341
    $
--
    $
3,744
    $
2,052
    $
26,682
 
Gross profit
  $
7,876
    $
5,922
    $
--
    $
1,575
    $
261
    $
15,634
 
Reconciling items (2)
   
 
     
 
     
 
     
 
     
 
     
(14,686
)
Earnings before income taxes
   
 
     
 
     
 
     
 
     
 
    $
948
 
   
Nine Months Ended December 31, 2019
 
   
Sterilization and Disinfection Control
   
Instruments
   
Biopharmaceutical Development
   
Cold Chain Monitoring
   
Cold Chain Packaging
   
Total
 
Revenues (1)
  $
35,823
    $
28,518
    $
5,637
    $
11,059
    $
2,442
    $
83,479
 
Gross profit (loss)
  $
25,323
    $
18,128
    $
(1,294
)   $
3,741
    $
394
    $
46,292
 
Reconciling items (2)
   
 
     
 
     
 
     
 
     
 
     
(42,471
)
Earnings before income taxes
   
 
     
 
     
 
     
 
     
 
    $
3,821
 
   
Nine Months Ended December 31, 2018
 
   
Sterilization and Disinfection Control
   
Instruments
   
Biopharmaceutical Development
   
Cold Chain Monitoring
   
Cold Chain Packaging
   
Total
 
Revenues (1)
  $
34,475
    $
26,776
    $
--
    $
9,917
    $
5,521
    $
76,689
 
Gross profit
  $
23,660
    $
16,909
    $
--
    $
4,203
    $
530
    $
45,302
 
Reconciling items (2)
   
 
     
 
     
 
     
 
     
 
     
(38,648
)
Earnings before income taxes
   
 
     
 
     
 
     
 
     
 
    $
6,654
 
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
December 31, 2019
   
March 31, 2019
 
Sterilization and Disinfection Control
  $
76,493
    $
74,230
 
Instruments
   
32,286
     
30,911
 
Biopharmaceutical Development
   
196,366
     
--
 
Cold Chain Monitoring
   
31,022
     
32,179
 
Cold Chain Packaging (a)
   
132
     
1,590
 
Corporate and administrative
   
87,168
     
17,857
 
Total
  $
423,467
    $
156,767