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Note 10 - Segment Information - Operating Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Revenues		$ 25,142	$ 22,673
Gross profit		15,091	12,671
Reconciling items	[1]	(10,691)	(11,368)
Earnings before income taxes		4,400	1,303
Sterilzation and Disinfection Control [Member]
Revenues		11,348	10,183
Gross profit		7,812	6,720
Reconciling items	[1]
Earnings before income taxes
Instruments [Member]
Revenues		8,731	8,603
Gross profit		5,633	4,908
Reconciling items	[1]
Earnings before income taxes
Cold Chain Monitoring [Member]
Revenues		3,223	2,917
Gross profit		1,464	894
Reconciling items	[1]
Earnings before income taxes
Cold Chain Packaging [Member]
Revenues		1,840	970
Gross profit		182	149
Reconciling items	[1]
Earnings before income taxes
[1] Reconciling items include selling, general and administrative, research and development, and other expenses

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