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Note 8 - Derivative Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2017
Designated as Hedging Instrument [Member]  
Notes Tables  
Schedule of Interest Rate Derivatives [Table Text Block]
(dollars in thousands)
                            
                                   
 
 
 
 
  
 
 
 
 
 
 
Fair Value
 
Notional
 
Maturity
  
Receive (variable)
 
Pay fixed
 
 
assets (liabilities)
 
amount
 
date
  
index
 
swap rate
 
 
March 31, 2017
 
 
December 31, 2016
 
$ 10,000  
12/6/2021
  
US 3 Month LIBOR
   
1.89
 %   $
46
    $
16
 
  20,000  
12/6/2020
  
US 3 Month LIBOR
   
1.79
 %    
61
     
9
 
$ 30,000  
 
  
 
    
1.82
 %   $
107
    $
25
 
Not Designated as Hedging Instrument [Member]  
Notes Tables  
Schedule of Interest Rate Derivatives [Table Text Block]
(dollar amounts in thousands)
 
Receiving
 
 
Paying
 
 
 
March 31,
 
 
December 31,
 
 
March 31,
 
 
December 31,
 
 
 
2017
 
 
2016
 
 
2017
 
 
2016
 
Notional amount
   $
43,380
    $
43,986
    $
43,380
    $
43,986
 
Weighted average maturity (years)
    
9.7
     
9.9
     
9.7
     
9.9
 
Fair value
   $
(331
 )   $
(178
 )   $
331
    $
178