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Segment Information (Details) (USD $)
 3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
segment
Sep. 30, 2011
Mar. 31, 2012
Segment Information          
Number of reportable segments     2    
Segment data          
Revenue $ 11,706,000 $ 9,701,000 $ 22,266,000 $ 18,998,000  
Gross profit 7,248,000 5,774,000 13,704,000 11,162,000  
Selling expenses 1,072,000 1,038,000 2,074,000 1,977,000  
Gross profit after deducting selling expense 6,176,000 4,736,000 11,630,000 9,185,000  
Earnings before income taxes 3,452,000 3,236,000 6,638,000 5,880,000  
Total assets 64,441,000   64,441,000   50,696,000
Net revenues from unaffiliated customers:          
Net revenues from unaffiliated customers 11,706,000 9,701,000 22,266,000 18,998,000  
Percentage of revenue, minimum 10.00% 10.00% 10.00% 10.00%  
Biological Indicators
          
Segment data          
Revenue 5,320,000 5,190,000 10,438,000 9,859,000  
Gross profit 3,063,000 2,911,000 5,956,000 5,217,000  
Selling expenses 414,000 427,000 780,000 802,000  
Gross profit after deducting selling expense 2,649,000 2,484,000 5,176,000 4,415,000  
Total assets 27,851,000   27,851,000   28,887,000
Net revenues from unaffiliated customers:          
Net revenues from unaffiliated customers 5,320,000 5,190,000 10,438,000 9,859,000  
Instruments
          
Segment data          
Revenue 6,386,000 4,511,000 11,828,000 9,139,000  
Gross profit 4,185,000 2,863,000 7,748,000 5,945,000  
Selling expenses 658,000 611,000 1,294,000 1,175,000  
Gross profit after deducting selling expense 3,527,000 2,252,000 6,454,000 4,770,000  
Total assets 32,851,000   32,851,000   13,572,000
Net revenues from unaffiliated customers:          
Net revenues from unaffiliated customers 6,386,000 4,511,000 11,828,000 9,139,000  
Reconciling items
          
Segment data          
Earnings before income taxes (2,724,000) (1,500,000) (4,992,000) (3,305,000)  
Corporate and administrative
          
Segment data          
Total assets 3,739,000   3,739,000   8,237,000
United States
          
Segment data          
Revenue 7,121,000 6,067,000 13,491,000 11,813,000  
Net revenues from unaffiliated customers:          
Net revenues from unaffiliated customers 7,121,000 6,067,000 13,491,000 11,813,000  
Foreign
          
Segment data          
Revenue 4,585,000 3,634,000 8,775,000 7,185,000  
Net revenues from unaffiliated customers:          
Net revenues from unaffiliated customers $ 4,585,000 $ 3,634,000 $ 8,775,000 $ 7,185,000