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Note 11 - Segment Information (Tables)
9 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended December 31, 2018
 
   
Sterilization
and
Disinfection
Control
   
Instruments
   
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
 
   
Three Months Ended December 31, 2017
 
   
Sterilization
and
Disinfection
Control
   
Instruments
   
Cold Chain
Monitoring
   
Cold Chain
Packaging
   
Total
 
Revenues
(1)
  $
10,630
    $
8,182
    $
3,267
    $
1,592
    $
23,671
 
                                         
Gross profit
  $
7,134
    $
5,150
    $
(43
)   $
440
    $
12,681
 
Reconciling items
(
2
)
   
 
     
 
     
 
     
 
     
(23,207
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
(10,526
)
   
Nine Months Ended December 31, 2018
 
   
Sterilization
and
Disinfection
Control
   
Instruments
   
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
 
   
Nine Months Ended December 31, 2017
 
   
Sterilization
and
Disinfection
Control
   
Instruments
   
Cold Chain
Monitoring
   
Cold Chain
Packaging
   
Total
 
Revenues
(1)
  $
30,798
    $
24,768
    $
9,335
    $
4,397
    $
69,298
 
                                         
Gross profit
  $
20,676
    $
15,021
    $
2,044
    $
844
    $
38,585
 
Reconciling items
(
2
)
   
 
     
 
     
 
     
 
     
(44,702
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
(6,117
)
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
December 31, 2018
   
March 31, 2018
 
Total assets
               
Sterilization and Disinfection Control
  $
76,983
    $
83,452
 
Instruments
   
29,332
     
33,479
 
Cold Chain Monitoring
   
34,749
     
30,796
 
Cold Chain Packaging
   
2,722
     
7,091
 
Corporate and administrative
   
14,374
     
9,283
 
Total
  $
158,160
    $
164,101
 
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Three Months Ended December 31,
   
Nine Months Ended December 31,
 
   
2018
   
2017
   
2018
   
2017
 
United States
  $
17,003
    $
14,221
    $
49,167
    $
41,664
 
Foreign
   
9,679
     
9,450
     
27,522
     
27,634
 
Total
  $
26,682
    $
23,671
    $
76,689
    $
69,298