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Segment Information (Details) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
segment
Dec. 31, 2011
Mar. 31, 2012
Segment Information          
Number of reportable segments     2    
Segment data          
Revenue $ 11,361,000 $ 9,650,000 $ 33,627,000 $ 28,648,000  
Gross profit 6,947,000 5,885,000 20,651,000 17,047,000  
Selling expenses 1,223,000 949,000 3,297,000 2,926,000  
Gross profit after deducting selling expense 5,724,000 4,936,000 17,354,000 14,121,000  
Earnings before income taxes 2,426,000 3,131,000 9,064,000 9,011,000  
Total assets 63,617,000   63,617,000   50,696,000
Net revenues from unaffiliated customers:          
United States 7,013,000 5,684,000 20,504,000 17,497,000  
Foreign 4,348,000 3,966,000 13,123,000 11,151,000  
Percentage of revenue, minimum 10.00% 10.00% 10.00% 10.00%  
Biological Indicators
          
Segment data          
Revenue 5,154,000 4,742,000 15,590,000 14,600,000  
Gross profit 2,936,000 2,540,000 8,890,000 7,756,000  
Selling expenses 385,000 391,000 1,165,000 1,194,000  
Gross profit after deducting selling expense 2,551,000 2,149,000 7,725,000 6,562,000  
Total assets 27,392,000   27,392,000   28,887,000
Instruments
          
Segment data          
Revenue 6,207,000 4,908,000 18,037,000 14,048,000  
Gross profit 4,011,000 3,345,000 11,761,000 9,291,000  
Selling expenses 838,000 558,000 2,132,000 1,732,000  
Gross profit after deducting selling expense 3,173,000 2,787,000 9,629,000 7,559,000  
Total assets 32,511,000   32,511,000   13,572,000
Reconciling items
          
Segment data          
Earnings before income taxes (3,298,000) (1,805,000) (8,290,000) (5,110,000)  
Corporate and administrative
          
Segment data          
Total assets $ 3,714,000   $ 3,714,000   $ 8,237,000