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Segment Data (Details) (USD $)
 3 Months Ended
Jun. 30, 2012
segment
Jun. 30, 2011
Mar. 31, 2012
Segment Data      
Number of reportable segments 2    
Segment data      
Revenue $ 10,559,000 $ 9,297,000  
Operating Income 3,219,000 2,693,000  
Other (Income) and Expense 34,000 50,000  
Capital Expenditures 185,000 187,000  
Bios acquisition 18,900,000    
Depreciation 203,000 165,000  
Amortization 581,000 376,000  
Total assets 66,711,000   50,696,000
Net revenues from unaffiliated customers:      
Net revenues from unaffiliated customers 10,559,000 9,297,000  
Percentage of revenue, minimum 10.00% 10.00%  
Biological Indicators
      
Segment data      
Revenue 5,118,000 4,668,000  
Operating Income 1,449,000 941,000  
Other (Income) and Expense (2,000) 53,000  
Capital Expenditures 33,000 125,000  
Depreciation 128,000 113,000  
Amortization 403,000 336,000  
Total assets 31,077,000   32,915,000
Net revenues from unaffiliated customers:      
Net revenues from unaffiliated customers 5,118,000 4,668,000  
Instruments
      
Segment data      
Revenue 5,441,000 4,629,000  
Operating Income 1,770,000 1,752,000  
Other (Income) and Expense 36,000 (3,000)  
Capital Expenditures 152,000 62,000  
Bios acquisition 18,900,000    
Depreciation 75,000 52,000  
Amortization 178,000 40,000  
Total assets 35,634,000   17,781,000
Net revenues from unaffiliated customers:      
Net revenues from unaffiliated customers 5,441,000 4,629,000  
United States
      
Segment data      
Revenue 6,369,000 5,746,000  
Net revenues from unaffiliated customers:      
Net revenues from unaffiliated customers 6,369,000 5,746,000  
Foreign
      
Segment data      
Revenue 4,190,000 3,551,000  
Net revenues from unaffiliated customers:      
Net revenues from unaffiliated customers $ 4,190,000 $ 3,551,000