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Note 9 - Warrants (Tables)
6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block]
   

June 30, 2013

   

June 30, 2012

 

Stock Price 

  $ 2.22     $ 3.12  

Exercise Price

  $ 14.93     $ 14.93  

Expected Volatility

    76 %     110 %

Expected Dividend Yield 

 

None 

   

None 

 

Expected Term (in years)

    2.9       3.9  

Risk-free Interest Rate

    0.66 %     0.39 %
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

2013

   

2012

 
           

Weighted

           

Weighted

 
           

Average

           

Average

 
           

Exercise

           

Exercise

 
   

Warrants

   

Price

   

Warrants

   

Price

 

Outstanding at January 1,

    412,776     $ 14.93       412,776     $ 14.93  

Issued

                               

Expired

                               

Warrant redemption

                               

Exercised

                               

Outstanding at June 30,

    412,776     $ 14.93       412,776     $ 14.93  

Currently exercisable

    412,776     $ 14.93       412,776     $ 14.93  
Schedule of Stockholders Equity [Table Text Block]
  Warrants Outstanding and Exercisable  
                     

Weighted

         
                     

Average

   

Weighted

 
                     

Remaining

   

Average

 
 

Range of

           

Contractual

   

Exercise

 
 

Exercise Prices

   

Warrants

   

Life (Years)

   

Price

 
  $ 13.80           112,776       2.9     $ 13.80  
  $ 13.86 to  $24.00       300,000       3.0       15.36  
                412,776       2.9     $ 14.93