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Note 12 - Major Customers and Geographic Information (Tables)
 12 Months Ended
Mar. 31, 2015
Notes Tables  
Revenue from External Customers by Products and Services [Table Text Block]
 
 
201
5
 
 
201
4
 
 
201
3
 
 
 
(in thousands)
 
Net sales:
                        
Natural astaxanthin products
                       
BioAstin®
  $ 22,087     $ 19,056     $ 18,618  
Spirulina products
    11,722       9,122       8,838  
Other products
    —       —       3  
    $ 33,809     $ 28,178     $ 27,459  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
 
 
2015
 
 
2014
 
 
2013
 
 
 
(dollars in thousands)
 
Net sales(1):
                                                
United States
  $ 24,049       71
%
   $ 17,355       62
%
   $ 17,393       63
%
Europe
     4,302       13
%
     5,237       19
%
     5,313       19
%
Asia / Pacific
     3,149       8
%
     3,106       10
%
     2,754       10
%
Other
    2,309       8
%
     2,480       9
%
     1,999       8
%
    $ 33,809       100
%
   $ 28,178       100
%
   $ 27,459       100
%