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Note 9 - Investment in Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
September 30, 2016
   
December 31, 2015
 
Amortized cost
  $ 4,368,749     $ 5,026,390  
Gross unrealized (losses) gains
    85,470       (24,668 )
Fair value*
  $ 4,454,219     $ 5,001,722