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Note 9 - Comprehensive Income (Tables)
 6 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Foreign Currency
Translation
    
 
AOCI
  
Balance at
June 30, 2017
   $
(1,009
 )   $
(1,009
 )
Quarter ended September 30
, 2017:
                
Unrealized gain
arising during the period
    
948
      
948
  
Balance at
September 30, 2017
   $
(61
 )   $
(61
 )
   
Foreign Currency
Translation
    
 
AOCI
  
Balance at June 30
, 2016
   $
(1,101
 )   $
(1,101
 )
Quarter ended September 30, 2016:
                
Unrealized loss
arising during the period
    
(185
 )    
(185
 )
Balance at September 30
, 2016
   $
(1,286
 )   $
(1,286
 )
   
Foreign Currency
Translation
    
 
AOCI
  
Balance at March 31
, 2017
   $
(1,760
 )   $
(1,760
 )
Six months ended September 30, 2017:
                
Unrealized gain
arising during the period
    
1,699
      
1,699
  
Balance at September 30
, 2017
   $
(61
 )   $
(61
 )
   
Foreign Currency
Translation
    
 
AOCI
  
Balance at March 31
, 2016
   $
(1,151
 )   $
(1,151
 )
Six months ended September 30, 2016:
                
Unrealized loss
arising during the period
    
(135
 )    
(135
 )
Balance at September 30
, 2016
   $
(1,286
 )   $
(1,286
 )