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Note 13 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Fair Value Measurements at March 31,
 
   
2017
   
2016
 
                 
Marketable securities (Level 1)
  $
4,593,667
    $
9,655,915
 
Acquisition contingent consideration obligations (Level 3)
  $
3,023,031
    $
-
 
Redeemable Non-Controlling Interest (Level 3)
  $
1,443,901
    $
-