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Note 5 - Fair Value (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
Liabilities Measured at Fair Value on a Recurri
ng Basis as of
June 30, 2018 and December 31, 2017
  
Description
  
Quoted Prices in
Active Markets
for Identical
Liabilities
(Level 1)
    
Significant
Other
Observable
Inputs (Level 2)
    
Significant
Unobservable
Inputs (Level 3)
    
Total
  
Liability related to MT warrants
   $
—
     $
—
     $
63,000
     $
63,000