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Note 2 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
2016
    
2015
    
2014
  
Weighted-average common shares
outstanding
    
2,494,022
     
2,251,365
     
2,231,165
 
                         
Average treasury stock shares
    
(386,165
 )    
(236,399
 )    
(189,530
 )
                         
Weighted-average common shares and
common stock equivalents used to
calculate basic earnings per share
    
2,107,857
     
2,014,966
     
2,041,635
 
                         
Additional common stock equivalents
used to calculate diluted
earnings per share
    
11,357
     
9,154
     
7,871
 
                         
Weighted-average common shares and
common stock equivalents used to
calculate diluted earnings per share
    
2,119,214
     
2,024,120
     
2,049,506