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Note 9 - Segment Information (Details) - Operating Segment Information - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]    
Revenues $ 18,158 $ 16,400
Gross profit 11,141 9,705
Selling expenses 1,799 2,063
Gross profit after deducting selling expense and impairment of intangible asset 9,342 7,642
Reconciling items [1] (5,816) (4,749)
Earnings before income taxes 3,526 2,893
Biological Indicators [Member]    
Segment Reporting Information [Line Items]    
Revenues 7,236 6,417
Gross profit 4,749 3,784
Selling expenses 360 404
Gross profit after deducting selling expense and impairment of intangible asset 4,389 3,380
Instruments [Member]    
Segment Reporting Information [Line Items]    
Revenues 8,331 7,685
Gross profit 5,355 4,927
Selling expenses 981 992
Gross profit after deducting selling expense and impairment of intangible asset 4,374 3,935
Continuous Monitoring [Member]    
Segment Reporting Information [Line Items]    
Revenues 2,591 2,298
Gross profit 1,037 994
Selling expenses 458 667
Gross profit after deducting selling expense and impairment of intangible asset $ 579 $ 327
[1] Reconciling items include general and administrative, research and development, and other expenses.