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Note 15 - Segment Data (Tables)
12 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Year Ended March
31, 201
8
 
   
Sterilization
and
Disinfection
Control
   
 
 
 
Instruments
   
 
 
Cold Chain
Monitoring
   
 
 
Cold Chain
Packaging
   
Total
 
Revenues
  $
43,260
    $
34,104
    $
12,978
    $
5,837
    $
96,179
 
                                         
Gross profit
  $
29,333
    $
20,395
    $
3,854
    $
1,037
     
54,619
 
Reconciling items
(1)
   
 
     
 
     
 
     
 
     
(54,318
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
301
 
   
Year Ended March
31, 201
7
 
   
Sterilization
and
Disinfection
Control
   
 
 
 
Instruments
   
 
 
Cold Chain
Monitoring
   
 
 
Cold Chain
Packaging
   
Total
 
Revenues
  $
38,635
    $
34,405
    $
12,584
    $
8,041
    $
93,665
 
                                         
Gross profit
  $
25,674
    $
21,037
    $
4,557
    $
1,971
     
53,239
 
Reconciling items
(1)
   
 
     
 
     
 
     
 
     
(38,943
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
14,296
 
   
Year Ended March 31, 201
6
 
   
Sterilization
and
Disinfection
Control
   
 
 
 
Instruments
   
 
 
Cold Chain
Monitoring
   
 
 
Cold Chain
Packaging
   
Total
 
Revenues
  $
33,649
    $
35,692
    $
11,566
    $
3,752
    $
84,659
 
                                         
Gross profit
  $
22,205
    $
23,223
    $
4,201
    $
1,784
     
51,413
 
Reconciling items
(1)
   
 
     
 
     
 
     
 
     
(35,858
)
Earnings before income taxes
   
 
     
 
     
 
     
 
    $
15,555
 
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Year E
nded March 31,
 
   
201
8
   
201
7
   
201
6
 
Revenues from unaffiliated customers
                       
United States
  $
56,998
    $
52,989
    $
53,094
 
Foreign
   
39,181
     
40,676
     
31,565
 
    $
96,179
    $
93,665
    $
84,659
 
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
March 31,
 
   
201
8
   
201
7
 
Total assets
               
Sterilization and Disinfection Control
  $
83,452
    $
67,233
 
Instruments
   
33,479
     
40,805
 
Cold Chain Monitoring
   
30,796
     
35,789
 
Cold Chain Packaging
   
7,091
     
20,313
 
Corporate and administrative
   
9,283
     
7,593
 
    $
164,101
    $
171,733