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Note 9 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Description
 
Balance at
December
31, 2016
   
Established
in 2017
   
Change in
Fair Value
   
Balance at
Dec
ember
31
,
2017
 
                                 
Warrant liability
  $
-
    $
15,876,546
    $
(633,631
)   $
15,242,915
 
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Level 1
   
Level 2
   
Level 3
   
Total
 
                                 
Warrant liability
  $
-
    $
-
    $
15,242,915
    $
15,242,915
 
Balance at
December 31, 2017
  $
-
    $
-
    $
15,242,915
    $
15,242,915