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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
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]
Consumables [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 49,589 44,974 41,948
Hardware and Software [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 32,209 29,412 31,562
Service [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 21,337 21,793 [2] 20,155 [2]
Service [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 12,069 11,355 12,602
Service [Member] | Transferred over Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 9,268 10,438 7,553
Sterilzation and Disinfection Control [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1] 46,297 43,260 38,635
Sterilzation and Disinfection Control [Member] | Consumables [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 39,670 36,436 31,851
Sterilzation and Disinfection Control [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 580 925 693
Sterilzation and Disinfection Control [Member] | Service [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 1,209 1,110 1,351
Sterilzation and Disinfection Control [Member] | Service [Member] | Transferred over Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 4,838 4,789 4,740
Instruments [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1] 36,125 34,104 34,405
Instruments [Member] | Consumables [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 3,101 3,080 2,917
Instruments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 24,500 23,345 24,098
Instruments [Member] | Service [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 8,524 7,679 7,390
Instruments [Member] | Service [Member] | Transferred over Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total
Cold Chain Monitoring [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1] 13,806 12,978 12,584
Cold Chain Monitoring [Member] | Consumables [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 388 261 175
Cold Chain Monitoring [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 6,987 5,051 6,748
Cold Chain Monitoring [Member] | Service [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 2,001 2,017 2,848
Cold Chain Monitoring [Member] | Service [Member] | Transferred over Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 4,430 5,649 2,813
Cold Chain Packaging [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1] 6,907 5,837 8,041
Cold Chain Packaging [Member] | Consumables [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 6,430 5,197 7,005
Cold Chain Packaging [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 142 91 23
Cold Chain Packaging [Member] | Service [Member] | Transferred at Point in Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 335 549 1,013
Cold Chain Packaging [Member] | Service [Member] | Transferred over Time [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total
[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."