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Note 15 - Segment Data - Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Reconciling items (1) | [1] |  |  |  |  |  |  |  |  |  |  |  |  | $ (38,943) | $ (35,858) | $ (28,045)
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,296 | 15,555 | 15,347
Revenues |  | $ 24,299 | $ 23,843 | $ 24,409 | $ 21,114 | $ 24,812 | $ 19,913 | $ 21,776 | $ 18,158 | $ 18,560 | $ 17,830 | $ 18,540 | $ 16,400 | 93,665 | 84,659 | 71,330
Gross profit |  | $ 13,964 | $ 13,537 | $ 13,724 | $ 12,014 | $ 14,996 | $ 12,209 | $ 13,067 | $ 11,141 | $ 11,512 | $ 11,052 | $ 11,123 | $ 9,705 | 53,239 | 51,413 | 43,392
Biological Indicators [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciling items (1) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,635 | 33,649 | 27,390
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,566 | 22,205 | 17,142
Instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciling items (1) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,405 | 35,692 | 33,054
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,172 | 23,223 | 20,763
Cold Chain Monitoring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciling items (1) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,584 | 11,566 | 10,886
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,533 | 4,201 | 5,487
Cold Chain Packaging [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciling items (1) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,041 | 3,752 |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,968 | $ 1,784 |
[1] | Reconciling items include selling, general and administrative, research and development, and other expenses

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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