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Note 4 - Investments (Tables)
6 Months Ended
Jun. 30, 2015
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
 
 
June 30,
 
 
December 31,
 
 
 
2015
 
 
2014
 
Cost basis
  $ 342,000     $ 327,000  
Gains previously recognized on warrants
    380,000       380,000  
Gains included in accumulated other comprehensive income
    773,000       2,133,000  
Fair value
  $ 1,495,000     $ 2,840,000  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
 
 
For the Six Months Ended
 
 
 
June 30,
 
 
 
2015
 
 
2014
 
Beginning balance
  $ -     $ 350,000  
Fair value change in common stock warrants
    -       30,000  
Fair value of warrants exercised
    -       (380,000 )
Ending balance
  $ -     $ -