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Note 7 - Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Fair Value Measurement Using
          
   
Quoted
Prices in
Active Markets
(Level 1)
    
Significant Other
Observable
Inputs
(Level 2)
    
Significant
Unobservable
Inputs
(Level 3)
    
Fair Value
Measurement
  
December 31
, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivative Instrument
                                
Interest rate swap
  $
-
     $
91,000
     $
-
     $
91,000
  
                                 
December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivative Instrument
                                
Interest rate swap
  $
-
     $
163,000
     $
-
     $
163,000