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Note 11 - Segment Information - Operating Segment Information (Details) - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Sep. 30, 2019

Sep. 30, 2018

Sep. 30, 2019

Sep. 30, 2018

Revenues

^[1]

$ 25,536

$ 24,865

$ 51,824

$ 50,007

Gross profit

15,476

14,577

31,615

29,668

Reconciling items

^[2]

(11,812)

(13,271)

(22,591)

(23,962)

Earnings before income taxes

3,664

1,306

9,024

5,706

Sterilzation and Disinfection Control [Member]

Revenues

^[1]

12,094

11,582

24,204

22,930

Gross profit

8,720

7,972

17,225

15,784

Reconciling items

^[2]

Earnings before income taxes

Instruments [Member]

Revenues

^[1]

8,960

8,704

18,504

17,435

Gross profit

5,545

5,354

11,608

10,987

Reconciling items

^[2]

Earnings before income taxes

Cold Chain Monitoring [Member]

Revenues

^[1]

3,586

2,950

6,903

6,173

Gross profit

1,126

1,164

2,370

2,628

Reconciling items

^[2]

Earnings before income taxes

Cold Chain Packaging [Member]

Revenues

^[1]

896

1,629

2,213

3,469

Gross profit

$ 85

87

412

269

Reconciling items

^[2]

Earnings before income taxes

[1]	Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.
[2]	Reconciling items include selling, general and administrative, research and development, legal settlement, and other expenses.

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