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Note 9 - Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
201
6
   
201
5
 
   
Debt
Outstanding
   
Weighted
Average
Interest Rate
   
Debt
Outstanding
   
Weighted
Average
Interest Rate
 
Revolving Line of Credit/Swing Line
  $
259,389
     
2.46
%   $
311,532
     
2.23
%