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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
item
Sep. 30, 2012
Mar. 31, 2013
Segment Information          
Number of reportable segments     2    
Segment data          
Revenues $ 12,676 $ 11,706 $ 23,894 $ 22,266  
Gross profit 7,600 7,248 14,397 13,704  
Selling expenses 1,419 1,072 2,502 2,074  
Gross profit after deducting selling expense 6,181 6,176 11,895 11,630  
Earnings before income taxes 2,938 3,452 5,953 6,638  
Total assets 65,787   65,787   65,919
Operating segment | Biological Indicators
          
Segment data          
Revenues 6,010 5,320 10,864 10,438  
Gross profit 3,482 3,063 6,043 5,956  
Selling expenses 556 414 946 780  
Gross profit after deducting selling expense 2,926 2,649 5,097 5,176  
Total assets 24,479   24,479   27,558
Operating segment | Instruments
          
Segment data          
Revenues 6,666 6,386 13,030 11,828  
Gross profit 4,118 4,185 8,354 7,748  
Selling expenses 863 658 1,556 1,294  
Gross profit after deducting selling expense 3,255 3,527 6,798 6,454  
Total assets 35,887   35,887   31,782
Reconciling items
          
Segment data          
Reconciling items (3,243) (2,724) (5,942) (4,992)  
Corporate and administrative
          
Segment data          
Total assets $ 5,421   $ 5,421   $ 6,579