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Note 15 - Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
Fair Value Measurement as of December 31, 2012
 
   
Total
   
 (Level 1)
   
(Level 2)
   
(Level 3)
 
Liabilities
                       
Interest rate swap contracts, current and long-term portion
  $ 2,393,568       -     $ 2,393,568       -  
   
Fair Value Measurement as of December 31, 2011
 
   
Total,
   
l  (Level 1)
   
(Level 2)
   
(Level 3)
 
Assets
                       
Trading securities
  $ 27,473     $ 27,473       -       -  
Liabilities
                               
Interest rate swap contracts, current and long-term portion
  $ 3,451,497       -     $ 3,451,497         -  
Total
          $ 27,473     $ 3,451,497