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Note 8 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months
Ended
    
Three Months
Ended
  
   
March 31,
2019
    
March 31,
2018
  
                 
Net income
  
$
1,096,287
    $
1,122,118
  
                 
Weighted average shares outstanding
  
 
1,682,997
     
1,667,833
  
                 
Earnings per share - basic and diluted
  
$
0.65
    $
0.67