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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 |

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