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Note 2 - Fair Value Measurement (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
As of June 30,
2018
 
Level 1
   
Level 2
   
Total
 
Bank deposits
  $
14,113,337
    $
    $
14,113,337
 
Money market funds
   
53,267
     
     
53,267
 
Total cash and cash equivalents
  $
14,166,604
    $
    $
14,166,604
 
As of December 31,
2017
 
Level 1
   
Level 2
   
Total
 
Bank deposits
  $
6,610,183
    $
    $
6,610,183
 
Money market funds
   
53,135
     
     
53,135
 
Total cash and cash equivalents
  $
6,663,318
    $
    $
6,663,318