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Note 13 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Fair Value Measurements at March 31,
 
   
2016
   
2015
 
                 
Marketable securities
  $
9,655,915
    $
5,278,752