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Note 5 - Goodwill and Intangible Assets - Change in the Carrying Amount of Goodwill (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Goodwill		$ 72,156,000	$ 66,137,000
Effect of foreign currency translation		1,258,000	(471,000)
Acquisitions		5,948,000	6,490,000
Impairment		(13,819,000)
Goodwill		65,543,000	72,156,000	66,137,000
Biological Indicators [Member]
Goodwill		24,019,000	20,898,000
Effect of foreign currency translation		536,000	(97,000)
Acquisitions		5,948,000	3,218,000
Impairment
Goodwill		30,503,000	24,019,000	20,898,000
Instruments [Member]
Goodwill		18,235,000	18,235,000
Effect of foreign currency translation
Acquisitions
Impairment
Goodwill		18,235,000	18,235,000	18,235,000
Cold Chain Monitoring [Member]
Goodwill		15,404,000	13,647,000
Effect of foreign currency translation
Acquisitions			1,757,000
Impairment
Goodwill		15,404,000	15,404,000	13,647,000
Cold Chain Packaging [Member]
Goodwill		14,498,000	13,357,000
Effect of foreign currency translation		722,000	(374,000)
Acquisitions			1,515,000
Impairment	$ (13,819,000)	(13,819,000)
Goodwill		$ 1,401,000	$ 14,498,000	$ 13,357,000

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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