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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2013
item
Jun. 30, 2012
Mar. 31, 2013
Segment Information      
Number of reportable segments 2    
Segment data      
Revenues $ 11,218 $ 10,559  
Gross profit 6,797 6,455  
Selling expenses 1,083 1,002  
Gross profit after deducting selling expense 5,714 5,453  
Reconciling items (2,699) (2,268)  
Earnings before income taxes 3,015 3,185  
Total assets 63,842   65,919
Net revenues from unaffiliated customers:      
United States 6,030 6,369  
Foreign 5,188 4,190  
Percentage of revenue, minimum 10.00% 10.00%  
Biological Indicators
      
Segment data      
Revenues 4,854 5,118  
Gross profit 2,561 2,894  
Selling expenses 390 365  
Gross profit after deducting selling expense 2,171 2,529  
Total assets 23,570   27,558
Instruments
      
Segment data      
Revenues 6,364 5,441  
Gross profit 4,236 3,561  
Selling expenses 693 637  
Gross profit after deducting selling expense 3,543 2,924  
Total assets 34,963   31,782
Corporate and administrative
      
Segment data      
Total assets $ 5,309   $ 6,579