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Note 13 - Segment Data (Details) - Operating Segment Information (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | 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, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 15,714 | $ 13,116 | $ 12,676 | $ 11,218 | $ 12,808 | $ 11,361 | $ 11,706 | $ 10,560 | $ 10,968 | $ 9,649 | $ 9,702 | $ 9,297 | $ 52,724 |  | $ 46,435 |  | $ 39,616 |
Gross profit | 9,585 | 7,706 | 7,600 | 6,797 | 8,211 | 6,947 | 7,248 | 6,456 | 6,464 | 5,885 | 5,774 | 5,388 | 31,688 |  | 28,862 |  | 23,511 |
Selling expenses |  |  |  |  |  |  |  |  |  |  |  |  | 6,119 |  | 4,630 |  | 3,909 |
Impairment of intangible asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350 |
Gross profit after deducting selling expense and impairment of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 25,569 |  | 24,232 |  | 19,252 |
Reconciling items |  |  |  |  |  |  |  |  |  |  |  |  | (12,466) | [1] | (11,254) | [1] | (6,921) | [1]
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 13,103 |  | 12,978 |  | 12,331 |
Biological Indicators [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 22,992 |  | 21,464 |  | 20,422 |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 13,187 |  | 12,365 |  | 11,236 |
Selling expenses |  |  |  |  |  |  |  |  |  |  |  |  | 1,350 |  | 1,552 |  | 1,607 |
Gross profit after deducting selling expense and impairment of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 11,837 |  | 10,813 |  | 9,629 |
Instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 26,389 |  | 24,971 |  | 19,194 |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 16,904 |  | 16,497 |  | 12,275 |
Selling expenses |  |  |  |  |  |  |  |  |  |  |  |  | 3,954 |  | 3,078 |  | 2,302 |
Impairment of intangible asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350 |
Gross profit after deducting selling expense and impairment of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 12,950 |  | 13,419 |  | 9,623 |
Continuous Monitoring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 3,343 |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 1,597 |  |  |  |  |
Selling expenses |  |  |  |  |  |  |  |  |  |  |  |  | 815 |  |  |  |  |
Gross profit after deducting selling expense and impairment of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 782 |  |  |  |  |
[1] | Reconciling items include general and administrative, research and development, and other expenses.

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