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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 item | Sep. 30, 2012 | Mar. 31, 2013
Segment Information |  |  |  |  |
Number of reportable segments |  |  | 2 |  |
Segment data |  |  |  |  |
Revenues | $ 12,676 | $ 11,706 | $ 23,894 | $ 22,266 |
Gross profit | 7,600 | 7,248 | 14,397 | 13,704 |
Selling expenses | 1,419 | 1,072 | 2,502 | 2,074 |
Gross profit after deducting selling expense | 6,181 | 6,176 | 11,895 | 11,630 |
Earnings before income taxes | 2,938 | 3,452 | 5,953 | 6,638 |
Total assets | 65,787 |  | 65,787 |  | 65,919
Operating segment | Biological Indicators |  |  |  |  |
Segment data |  |  |  |  |
Revenues | 6,010 | 5,320 | 10,864 | 10,438 |
Gross profit | 3,482 | 3,063 | 6,043 | 5,956 |
Selling expenses | 556 | 414 | 946 | 780 |
Gross profit after deducting selling expense | 2,926 | 2,649 | 5,097 | 5,176 |
Total assets | 24,479 |  | 24,479 |  | 27,558
Operating segment | Instruments |  |  |  |  |
Segment data |  |  |  |  |
Revenues | 6,666 | 6,386 | 13,030 | 11,828 |
Gross profit | 4,118 | 4,185 | 8,354 | 7,748 |
Selling expenses | 863 | 658 | 1,556 | 1,294 |
Gross profit after deducting selling expense | 3,255 | 3,527 | 6,798 | 6,454 |
Total assets | 35,887 |  | 35,887 |  | 31,782
Reconciling items |  |  |  |  |
Segment data |  |  |  |  |
Reconciling items | (3,243) | (2,724) | (5,942) | (4,992) |
Corporate and administrative |  |  |  |  |
Segment data |  |  |  |  |
Total assets | $ 5,421 |  | $ 5,421 |  | $ 6,579

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