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Note 4 - Investments (Tables)
 6 Months Ended
Jun. 30, 2015
Notes Tables  
Marketable Securities [Table Text Block]
    December 31, 2014
    Amortized
Cost		   Unrealized
Gains		   Unrealized
Losses		   Fair
Value
Bank certificates of deposit   $ 6,750,000     $ -     $ -     $ 6,750,000  
    June 30, 2015
    Amortized
Cost		   Unrealized
Gains		   Unrealized
Losses		   Fair
Value
Corporate debt securities   $ 3,018,070     $ -     $ (4,920 )   $ 3,013,150  
Bank certificates of deposit     15,500,000       -       -       15,500,000  
    $ 18,518,070     $ -     $ (4,920 )   $ 18,513,150