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Note 14 - Segment Data - Operating Segment Information (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2019

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2019

Mar. 31, 2018

Mar. 31, 2017

Revenue from Contract with Customer, Excluding Assessed Tax, Total

^[1]

$ 103,135

$ 96,179

^[2]

$ 93,665

^[2]

Gross profit

$ 15,614

$ 15,634

$ 14,577

$ 15,091

$ 16,034

$ 12,681

$ 13,233

$ 12,671

60,916

54,619

53,239

Reconciling items

^[3]

(52,293)

(54,318)

(38,943)

Earnings before income taxes

8,623

301

14,296

Sterilzation and Disinfection Control [Member]

Revenue from Contract with Customer, Excluding Assessed Tax, Total

^[1]

46,297

43,260

38,635

Gross profit

31,861

29,333

25,674

Reconciling items

^[3]

Earnings before income taxes

Instruments [Member]

Revenue from Contract with Customer, Excluding Assessed Tax, Total

^[1]

36,125

34,104

34,405

Gross profit

22,866

20,395

21,037

Reconciling items

^[3]

Earnings before income taxes

Cold Chain Monitoring [Member]

Revenue from Contract with Customer, Excluding Assessed Tax, Total

^[1]

13,806

12,978

12,584

Gross profit

5,582

3,854

4,557

Reconciling items

^[3]

Earnings before income taxes

Cold Chain Packaging [Member]

Revenue from Contract with Customer, Excluding Assessed Tax, Total

^[1]

6,907

5,837

8,041

Gross profit

607

1,037

1,971

Reconciling items

^[3]

Earnings before income taxes

[1]	Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.
[2]	Product and service revenues for the years ended March 31, 2018 and March 31, 2017 were reclassified to align with the current year presentation See Note 2. "Revenue Recognition."
[3]	Reconciling items include selling, general and administrative, research and development, impairment loss on goodwill and long-lived assets, legal settlement, and other expenses.

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