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Note 16 - Stock-based Compensation Plan (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
    Number
of
Shares		   Weighted
Average
Grant-Date
Fair Value
         
Nonvested at beginning of year    
18,000
     $
24.50
  
Granted    
-
      
-
  
Vested    
4,000
      
24.50
  
Forfeited    
-
      
-
  
                 
Nonvested at end of year    
14,000
     $
24.50