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Note 10 - Segment Information (Tables)
6 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended September 30, 2017
 
   
Sterilization
and
Disinfection
Control
   
 
 
 
Instruments
   
 
 
Cold Chain
Monitoring
   
 
 
Cold Chain
Packaging
   
Total
 
Revenues
  $
9,985
    $
7,983
    $
3,151
    $
1,835
    $
22,954
 
                                         
Gross profit
  $
6,822
    $
4,963
    $
1,193
    $
255
     
13,233
 
Reconciling items
(1)
   
 
     
 
     
 
     
 
     
(10,127
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
3,106
 
   
Three Months Ended September 30, 2016
 
   
Sterilization
and
Disinfection
Control
   
 
 
 
Instruments
   
 
 
Cold Chain
Monitoring
   
 
 
Cold Chain
Packaging
   
Total
 
Revenues
  $
8,897
    $
8,693
    $
3,545
    $
3,274
    $
24,409
 
                                         
Gross profit
  $
5,833
    $
5,326
    $
1,657
    $
908
     
13,724
 
Reconciling items
(1)
   
 
     
 
     
 
     
 
     
(10,512
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
3,212
 
   
Six Months Ended September 30, 2017
 
   
Sterilization
and
Disinfection
Control
   
 
 
 
Instruments
   
 
 
Cold Chain
Monitoring
   
 
 
Cold Chain
Packaging
   
Total
 
Revenues
  $
20,168
    $
16,586
    $
6,068
    $
2,805
    $
45,627
 
                                         
Gross profit
  $
13,542
    $
9,871
    $
2,087
    $
404
     
25,904
 
Reconciling items
(1)
   
 
     
 
     
 
     
 
     
(21,495
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
4,409
 
   
Six Months Ended September 30, 2016
 
   
Sterilization
and
Disinfection
Control
   
 
 
 
Instruments
   
 
 
Cold Chain
Monitoring
   
 
 
Cold Chain
Packaging
   
Total
 
Revenues
  $
18,364
    $
16,915
    $
5,862
    $
4,382
    $
45,523
 
                                         
Gross profit
  $
11,920
    $
10,175
    $
2,324
    $
1,319
     
25,738
 
Reconciling items
(1)
   
 
     
 
     
 
     
 
     
(20,357
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
5,381
 
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
September
3
0
, 201
7
   
March 31,
201
7
 
Total assets
(in thousands):
               
Sterilization and Disinfection Control
  $
67,374
    $
67,233
 
Instruments
   
34,729
     
40,805
 
Cold Chain Monitoring
   
34,206
     
35,789
 
Cold Chain Packaging
   
21,763
     
20,313
 
Corporate and administrative
   
15,861
     
7,593
 
    $
173,933
    $
171,733
 
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Three
M
onths
E
nded
September
3
0
,
   
Six Months Ended
September
3
0
,
 
   
201
7
   
201
6
   
201
7
   
201
6
 
Net revenues from unaffiliated customers:
                               
United States
  $
14,432
    $
15,403
    $
27,443
    $
30,914
 
Foreign
   
8,522
     
9,006
     
18,184
     
14,609
 
    $
22,954
    $
24,409
    $
45,627
    $
45,523