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Note 16 - Segment Data - Operating Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1]                 $ 117,687 $ 103,135 $ 96,179
Gross profit (loss) $ 18,641 $ 14,677 $ 15,476 $ 16,139 $ 15,614 $ 15,634 $ 14,577 $ 15,091 64,933 60,916 54,619
Reconciling items [2]                 (61,500) (52,293) (54,318)
Earnings before income taxes                 3,433 8,623 301
Capital expenditures                 1,498 1,262 2,799
Depreciation and amortization                 12,990 9,428 9,471
Operating Segments [Member] | Sterilzation and Disinfection Control [Member]                      
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1]                 49,660 46,297 43,260
Gross profit (loss)                 35,758 31,861 29,333
Capital expenditures                 291 384 1,007
Depreciation and amortization                 902 902 823
Operating Segments [Member] | Instruments [Member]                      
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1]                 37,984 36,125 34,104
Gross profit (loss)                 24,229 22,866 20,395
Capital expenditures                 165 56 254
Depreciation and amortization                 179 207 263
Operating Segments [Member] | Biopharmaceutical Development [Member]                      
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1]                 13,851    
Gross profit (loss)                 382    
Capital expenditures                 233    
Depreciation and amortization                 358    
Operating Segments [Member] | Continuous Monitoring [Member]                      
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1]                 13,729 13,806 12,978
Gross profit (loss)                 4,146 5,582 3,854
Capital expenditures                 201 254 483
Depreciation and amortization                 328 272 327
Corporate, Non-Segment [Member]                      
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1]                 2,463 6,907 5,837
Gross profit (loss)                 418 607 1,037
Capital expenditures                 608 568 1,055
Depreciation and amortization                 $ 11,223 $ 8,047 $ 8,058
[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 of goodwill and long-lived assets, legal settlement, and nonoperating expenses.