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Note 8 - Derivative Instruments and Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
 
 
December 31, 2015
 
 
December 31, 2014
 
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                 
Investment
  $       $           $ 8,300,740