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Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2013
item
Mar. 31, 2012
Mar. 31, 2011
Segment Data                              
Number of reportable segments                         2    
Segment data                              
Revenue $ 12,808 $ 11,361 $ 11,706 $ 10,560 $ 10,968 $ 9,649 $ 9,702 $ 9,297 $ 10,377 $ 8,000 $ 8,072 $ 7,778 $ 46,435 $ 39,616 $ 34,227
Gross profit 8,211 6,947 7,248 6,456 6,464 5,885 5,774 5,388 6,195 4,440 4,552 4,381 28,862 23,511 19,568
Selling expenses                         4,630 3,909 3,687
Impairment of intangible asset                           350  
Gross profit after deducting selling expense and impairment of intangible asset                         24,232 19,252 15,881
Reconciling items                         (11,254) (6,921) (6,130)
Earnings before income taxes                         12,978 12,331 9,751
Total assets 65,919       50,696               65,919 50,696  
Revenues from unaffiliated customers                              
United States                         28,590 23,770 21,053
Foreign                         17,845 15,846 13,174
Biological Indicators
                              
Segment data                              
Revenue                         21,464 20,422 16,822
Gross profit                         12,365 11,236 8,918
Selling expenses                         1,552 1,607 1,554
Gross profit after deducting selling expense and impairment of intangible asset                         10,813 9,629 7,364
Total assets 27,558       28,887               27,558 28,887  
Instruments
                              
Segment data                              
Revenue                         24,971 19,194 17,405
Gross profit                         16,497 12,275 10,650
Selling expenses                         3,078 2,302 2,133
Impairment of intangible asset                           350  
Gross profit after deducting selling expense and impairment of intangible asset                         13,419 9,623 8,517
Total assets 31,782       13,572               31,782 13,572  
Corporate and administrative
                              
Segment data                              
Total assets $ 6,579       $ 8,237               $ 6,579 $ 8,237