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Note 16 - Stock-based Compensation Plan (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
      Weighted
   
Number
  
Average
   
of
  
Grant-Date
   
Shares
  
Fair Value
         
Nonvested at beginning of year    
14,000
 
   $
24.50
 
Granted    
-
 
    
-
 
Vested    
3,500
 
    
24.50
 
Forfeited    
-
 
    
-
 
                 
Nonvested at end of year    
10,500
 
   $
24.50