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Note 8 - Comprehensive Income (Tables)
 9 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
 
Foreign Currency Translation
 
 
AOCI
 
Balance at September 30, 2016
   $
(1,286
 )   $
(1,286
 )
Quarter ended December 31, 2016:
                
Unrealized loss arising during the period
    
(634
 )    
(634
 )
Balance at December 31, 2016
   $
(1,920
 )   $
(1,920
 )
 
 
Foreign Currency Translation
 
 
AOCI
 
Balance at September 30, 2015
   $
397
     $
397
  
Quarter ended December 31, 2015:
                
Unrealized loss arising during the period
    
(1,847
 )    
(1,847
 )
Balance at December 31, 2015
   $
(1,450
 )   $
(1,450
 )
 
 
Foreign Currency Translation
 
 
AOCI
 
Balance at March 31, 2016
   $
(1,151
 )   $
(1,151
 )
Nine months ended December 31, 2016:
                
Unrealized loss arising during the period
    
(769
 )    
(769
 )
Balance at December 31, 2016
   $
(1,920
 )   $
(1,920
 )
 
 
Foreign Currency Translation
 
 
AOCI
 
Balance at March 31, 2015
   $
(234
 )   $
(234
 )
Nine months ended December 31, 2015:
                
Unrealized loss arising during the period
    
(1,216
 )    
(1,216
 )
Balance at December 31, 2015
   $
(1,450
 )   $
(1,450
 )