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Note 15 - Segment Data (Tables) | 12 Months Ended
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Mar. 31, 2017
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Year Ended March 31, 201 7 |
|  | Biological Indicators |  |  | Instruments |  |  | Cold Chain Monitoring |  |  | Cold Chain Packaging |  |  | Total |
Revenues |  | $ | 38,635 |  |  | $ | 34,405 |  |  | $ | 12,584 |  |  | $ | 8,041 |  |  | $ | 93,665 |
Gross profit |  | $ | 25,566 |  |  | $ | 21,172 |  |  | $ | 4,533 |  |  | $ | 1,968 |  |  |  | 53,239 |
Reconciling items (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (38,943 | )
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 14,296 |
|  | Year Ended March 31, 201 6 |
|  | Biological Indicators |  |  | Instruments |  |  | Cold Chain Monitoring |  |  | Cold Chain Packaging |  |  | Total |
Revenues |  | $ | 33,649 |  |  | $ | 35,692 |  |  | $ | 11,566 |  |  | $ | 3,752 |  |  | $ | 84,659 |
Gross profit |  | $ | 22,205 |  |  | $ | 23,223 |  |  | $ | 4,201 |  |  | $ | 1,784 |  |  |  | 51,413 |
Reconciling items (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (35,858 | )
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 15,555 |
|  | Year Ended March 31, 2015 |
|  | Biological Indicators |  |  | Instruments |  |  | Cold Chain Monitoring |  |  | Cold Chain Packaging |  |  | Total |
Revenues |  | $ | 27,390 |  |  | $ | 33,054 |  |  | $ | 10,886 |  |  | $ | -- |  |  | $ | 71,330 |
Gross profit |  | $ | 17,142 |  |  | $ | 20,763 |  |  | $ | 5,487 |  |  | $ | -- |  |  | $ | 43,392 |
Reconciling items (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (28,045 | )
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 15,347 |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
|  | Year Ended March 31, |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 52,989 |  |  | $ | 53,094 |  |  | $ | 45,798 |
Foreign |  |  | 40,676 |  |  |  | 31,565 |  |  |  | 25,532 |
|  | $ | 93,665 |  |  | $ | 84,659 |  |  | $ | 71,330 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | March 31, |
|  | 2017 |  |  | 2016 |
Total assets |  |  |  |  |  |  |  |
Biological Indicators |  | $ | 67,233 |  |  | $ | 56,724 |
Instruments |  |  | 40,805 |  |  |  | 49,077 |
Cold Chain Monitoring |  |  | 35,789 |  |  |  | 27,613 |
Cold Chain Packaging |  |  | 20,313 |  |  |  | 19,478 |
Corporate and administrative |  |  | 7,593 |  |  |  | 7,856 |
|  | $ | 171,733 |  |  | $ | 160,748 |

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