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Note 4 - Fair Values of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
 
 
Total Fair
Value on
the
Balance
Sheet
 
 
Quoted Prices
In Active
Markets For
Identical
Assets/Liabilities
(Level 1)
 
 
Significant
Other
Observable
Inputs
(Level 2)
 
 
Significant
Unobservable
Inputs
(Level 3)
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Recurring items as of December 31, 2016
                                
Investment securities, available for sale
  $
1,680,000
     $
1,680,000
     $ ─     $
─
  
                                 
Recurring items as of December 31, 2015
                                
Investment securities, available for sale
   $
10,799,890
     $
10,799,890
     $ ─     $
─
  
                                 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Recurring items as of December 31, 2016
                                
Earn-out milestone liability (Note 12)
   $
13,188,226
     $
─
     $ ─     $
13,188,226
  
                                 
Recurring items as of December 31, 2015
                                
Earn-out milestone liability (Note 12)
   $
13,921,412
     $
─
     $ ─     $
13,921,412