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Note 14 - Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2016		Mar. 31, 2015		Mar. 31, 2014
Biological Indicators [Member]
Revenues													$ 33,649		$ 27,390		$ 22,992
Gross profit													22,205		17,142		13,187
Selling expenses													1,734		1,551		1,350
Gross profit after deducting selling expense and impairment of intangible asset													$ 20,471		$ 15,591		$ 11,837
Reconciling items (1)														[1]		[1]
Earnings before income taxes
Instruments [Member]
Revenues													$ 35,692		$ 33,054		$ 26,389
Gross profit													23,223		20,763		16,904
Selling expenses													3,848		3,441		3,954
Gross profit after deducting selling expense and impairment of intangible asset													$ 19,375		$ 17,322		$ 12,950
Reconciling items (1)														[1]		[1]
Earnings before income taxes
Continuous Monitoring [Member]
Revenues													$ 10,792		$ 10,886		$ 3,343
Gross profit													4,154		5,487		1,597
Selling expenses													1,642		2,184		815
Gross profit after deducting selling expense and impairment of intangible asset													$ 2,512		$ 3,303		$ 782
Reconciling items (1)														[1]		[1]
Earnings before income taxes
Cold Chain [member]
Revenues													$ 4,526
Gross profit													1,831
Selling expenses													276
Gross profit after deducting selling expense and impairment of intangible asset													$ 1,555
Reconciling items (1)														[1]		[1]
Earnings before income taxes
Revenues	$ 24,812	$ 19,913	$ 21,776	$ 18,158	$ 18,560	$ 17,830	$ 18,540	$ 16,400	$ 15,714	$ 13,116	$ 12,676	$ 11,218	$ 84,659		$ 71,330		$ 52,724
Gross profit	$ 14,996	$ 12,209	$ 13,067	$ 11,141	$ 11,512	$ 11,052	$ 11,123	$ 9,705	$ 9,585	$ 7,706	$ 7,600	$ 6,797	51,413		43,392		31,688
Selling expenses													7,500		7,176		6,119
Gross profit after deducting selling expense and impairment of intangible asset													43,913		36,216		25,569
Reconciling items (1)													(28,358)	[1]	(20,869)	[1]	(12,466)
Earnings before income taxes													$ 15,555		$ 15,347		$ 13,103
[1] Reconciling items include general and administrative, research and development, and other expenses.

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