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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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