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Note 15 - Segment Data - Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | 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, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Revenue |  | $ 26,881 | $ 23,671 | $ 22,954 | $ 22,673 | $ 24,299 | $ 23,843 | $ 24,409 | $ 21,114 | $ 24,812 | $ 19,913 | $ 21,776 | $ 18,158 | $ 96,179 | $ 93,665 | $ 84,659
Gross profit |  | $ 16,034 | $ 12,681 | $ 13,233 | $ 12,671 | $ 13,964 | $ 13,537 | $ 13,724 | $ 12,014 | $ 14,996 | $ 12,209 | $ 13,067 | $ 11,141 | 54,619 | 53,239 | 51,413
Reconciling items | [1] |  |  |  |  |  |  |  |  |  |  |  |  | (54,318) | (38,943) | (35,858)
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 301 | 14,296 | 15,555
Sterilzation and Disinfection Control [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,260 | 38,635 | 33,649
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,333 | 25,674 | 22,205
Reconciling items | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,104 | 34,405 | 35,692
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,395 | 21,037 | 23,223
Reconciling items | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cold Chain Monitoring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,978 | 12,584 | 11,566
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,854 | 4,557 | 4,201
Reconciling items | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cold Chain Packaging [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,837 | 8,041 | 3,752
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,037 | 1,971 | 1,784
Reconciling items | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Reconciling items include selling, general and administrative, research and development, impairment of goodwill and other expenses.

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