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Note 14 - Segment Data - Revenues From External Customers (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]
UNITED STATES      
Revenue from Contract with Customer, Excluding Assessed Tax, Total 64,828 56,998 52,989
Non-US [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 38,307 $ 39,181 $ 40,676
[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."