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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Jun. 30, 2013 item | Jun. 30, 2012 | Mar. 31, 2013
Segment Information |  |  |
Number of reportable segments | 2 |  |
Segment data |  |  |
Revenues | $ 11,218 | $ 10,559 |
Gross profit | 6,797 | 6,455 |
Selling expenses | 1,083 | 1,002 |
Gross profit after deducting selling expense | 5,714 | 5,453 |
Reconciling items | (2,699) | (2,268) |
Earnings before income taxes | 3,015 | 3,185 |
Total assets | 63,842 |  | 65,919
Net revenues from unaffiliated customers: |  |  |
United States | 6,030 | 6,369 |
Foreign | 5,188 | 4,190 |
Percentage of revenue, minimum | 10.00% | 10.00% |
Biological Indicators |  |  |
Segment data |  |  |
Revenues | 4,854 | 5,118 |
Gross profit | 2,561 | 2,894 |
Selling expenses | 390 | 365 |
Gross profit after deducting selling expense | 2,171 | 2,529 |
Total assets | 23,570 |  | 27,558
Instruments |  |  |
Segment data |  |  |
Revenues | 6,364 | 5,441 |
Gross profit | 4,236 | 3,561 |
Selling expenses | 693 | 637 |
Gross profit after deducting selling expense | 3,543 | 2,924 |
Total assets | 34,963 |  | 31,782
Corporate and administrative |  |  |
Segment data |  |  |
Total assets | $ 5,309 |  | $ 6,579

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