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

3 Months Ended

9 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Revenues

^[1]

$ 26,682

$ 23,671

$ 76,689

$ 69,298

Gross profit

15,634

12,681

45,302

38,585

Reconciling items

^[2]

(14,686)

(23,207)

(38,648)

(44,702)

Earnings before income taxes

948

(10,526)

6,654

(6,117)

Sterilzation and Disinfection Control [Member]

Revenues

^[1]

11,545

10,630

34,475

30,798

Gross profit

7,876

7,134

23,660

20,676

Reconciling items

^[2]

Earnings before income taxes

Instruments [Member]

Revenues

^[1]

9,341

8,182

26,776

24,768

Gross profit

5,922

5,150

16,909

15,021

Reconciling items

^[2]

Earnings before income taxes

Cold Chain Monitoring [Member]

Revenues

^[1]

3,744

3,267

9,917

9,335

Gross profit

1,575

(43)

4,203

2,044

Reconciling items

^[2]

Earnings before income taxes

Cold Chain Packaging [Member]

Revenues

^[1]

2,052

1,592

5,521

4,397

Gross profit

261

440

530

844

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, impairment loss on goodwill and long-lived assets, estimated legal settlement, and other expenses.

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