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Note 10 - Segment Information - Operating Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues		$ 24,865	$ 22,954	$ 50,007	$ 45,627
Gross profit		14,577	13,233	29,668	25,904
Reconciling items	[1]	(13,271)	(10,127)	(23,962)	(21,495)
Earnings before income taxes		1,306	3,106	5,706	4,409
Sterilzation and Disinfection Control [Member]
Revenues		11,582	9,985	22,930	20,168
Gross profit		7,972	6,822	15,784	13,542
Reconciling items	[1]
Earnings before income taxes
Instruments [Member]
Revenues		8,704	7,983	17,435	16,586
Gross profit		5,354	4,963	10,987	9,871
Reconciling items	[1]
Earnings before income taxes
Cold Chain Monitoring [Member]
Revenues		2,950	3,151	6,173	6,068
Gross profit		1,164	1,193	2,628	2,087
Reconciling items	[1]
Earnings before income taxes
Cold Chain Packaging [Member]
Revenues		1,629	1,835	3,469	2,805
Gross profit		87	255	269	404
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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