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Note 8 - Derivative Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
Forward Start
 
Termination
 
Derivative
 
Notional
   
Rate
   
Rate
 
Estimated Fair Value
 
Inception Date
 
Date
 
Type
 
Amount
   
Paid
   
Hedged
 
at March 31, 2018
 
                                     
2/28/2018
 
2/28/2025
 
Interest rate swap
  $
50,000,000
     
2.12
%  
3 month LIBOR Floating
  $
1,833,515