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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 7 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Oct. 31, 2013
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Dec. 31, 2013
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Dec. 31, 2012
Mar. 31, 2013
Segment Information            
Number of reportable segments     2 3    
Segment data            
Revenues $ 13,116 $ 11,361   $ 37,010 $ 33,627  
Gross profit 7,706 6,947   22,103 20,651  
Selling expenses 1,595 1,223   4,097 3,297  
Gross profit after deducting selling expense 6,111 5,724   18,006 17,354  
Earnings before income taxes 2,727 2,426   8,680 9,064  
Total assets 92,555     92,555   65,919
Operating segment | Biological Indicators
            
Segment data            
Revenues 5,317 5,154   16,181 15,590  
Gross profit 2,976 2,936   9,019 8,890  
Selling expenses 404 385   1,350 1,165  
Gross profit after deducting selling expense 2,572 2,551   7,669 7,725  
Total assets 25,710     25,710   27,558
Operating segment | Instruments
            
Segment data            
Revenues 6,438 6,207   19,468 18,037  
Gross profit 4,137 4,011   12,491 11,761  
Selling expenses 1,047 838   2,603 2,132  
Gross profit after deducting selling expense 3,090 3,173   9,888 9,629  
Total assets 33,759     33,759   31,782
Operating segment | Continuous Monitoring
            
Segment data            
Revenues 1,361     1,361    
Gross profit 593     593    
Selling expenses 144     144    
Gross profit after deducting selling expense 449     449    
Total assets 28,485     28,485    
Reconciling items
            
Segment data            
Reconciling items (3,384) (3,298)   (9,326) (8,290)  
Corporate and administrative
            
Segment data            
Total assets $ 4,601     $ 4,601   $ 6,579