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Note 10 - Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2015
Disclosure Text Block Supplement [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
    Fair Value Measurement at Reporting Date Using
   

Total,

December 31,

2014

  (Level 1)   (Level 2)   (Level 3)

Liabilities

                               
Interest rate swap contracts, current and long-term portion   $ 298,771       -     $ 298,771       -  
    Fair Value Measurement at Reporting Date Using
   

Total,

June 30,

2015

  (Level 1)   (Level 2)   Significant Other
Unobservable
Inputs (Level 3)

Liabilities

                               
Interest rate swap contracts, current and long-term portion   $ 334,716       -     $ 334,716       -  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Derivatives not designated as hedging instruments

Balance Sheet Location

 December 31, 2014

 June 30, 2015

Interest rate contracts Current liabilities - Derivatives 297,992 147,388
Interest rate contracts Long-term liabilities - Derivatives   779 187,328
Total derivative liabilities   298,771 334,716
Derivative Instruments, Gain (Loss) [Table Text Block]
Derivatives not designated as hedging instruments

 Location of gain (loss) recognized

Six Months Ended June 30, 2014 Six Months Ended June 30, 2015
Interest rate – Fair value Loss on derivatives, net 341,902 (35,945)
Interest rate contracts  - Realized loss Loss on derivatives net (437,767) (129,327)
Total loss on derivatives   (95,865) (165,272)
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
  Other investment Valuation Technique Unobservable Input Value
Fair Value at December 31, 2014 6,183,800 Discounted cash flow

Rate of return 

19%
Fair Value at June 30, 2015 6,749,050 Discounted cash flow

Rate of return

19%