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Note 3 - Investments (Tables)
12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   

December 31,

 
   

2014

   

2013

 

Cost basis

  $ 327,000     $ 255,000  

Gains previously recognized on warrants

    380,000       -  

Gains included in accumulated other comprehensive income

    2,133,000       1,001,000  

Fair value

  $ 2,840,000     $ 1,256,000  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

December 31,

 
   

2014

   

2013

 

Beginning balance

  $ 350,000     $ -  

Fair value change in common stock warrants

    30,000       350,000  

Fair value of warrants exercised

    (380,000 )     -  

Ending balance

  $ -     $ 350,000