Note 6 - Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure Text Block Supplement [Abstract]  
Marketable Securities [Table Text Block]
   

December 31, 2015

 
   

Adjusted

Cost

   

Unrealized

Gains

   

Unrealized

Losses

   

Fair

Value

 

Equity instruments

  $ 10,825     $ 44     $ (711

)

  $ 10,158  

Preferred stock

    37,703       2,419       (122

)

    40,000  

Trust preferred securities

    16,464       1,303       (66

)

    17,701  

Exchange traded debt instruments

    6,511       297       -       6,808  

Total

  $ 71,503     $ 4,063     $ (899

)

  $ 74,667  
   

December 31, 2014

 
   

Adjusted

Cost

   

Unrealized

Gains

   

Unrealized

Losses

   

Fair

Value

 

Equity instruments

  $ 35,062     $ 5,214     $ (1,526

)

  $ 38,750  

Preferred stock

    21,660       1,626       -       23,286  

Trust preferred securities

    18,920       1,285       (1

)

    20,204  

Exchange traded debt instruments

    5,292       192       (4

)

    5,480  

Total

  $ 80,934     $ 8,317     $ (1,531

)

  $ 87,720