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Note 14 - Accumulated Other Comprehensive Income (Loss) (Tables)
12 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Foreign
Currency
Translation
   
AOCI
 
Balance at March 31, 2016
  $
(1,151
)   $
(1,151
)
Unrealized losses arising during the year
   
(609
)    
(609
)
Balance at March 31, 2017
   
(1,760
)    
(1,760
)
Unrealized gains arising during the year
   
2,324
     
2,324
 
Balance at March 31, 2018
  $
564
    $
564