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Note 17 - Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2017
   
2016
   
2015
 
                         
Net income attributable to QCR Holdings, Inc. common stockholders
  $
35,706,507
    $
27,686,787
    $
16,927,881
 
                         
EPS attributable to QCR Holdings, Inc. common stockholders
                       
Basic
  $
2.68
    $
2.20
    $
1.64
 
Diluted
  $
2.61
    $
2.17
    $
1.61
 
                         
Weighted average common shares outstanding*
   
13,325,128
     
12,570,767
     
10,345,286
 
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan**
   
355,344
     
195,236
     
154,555
 
Weighted average common and common equivalent shares outstanding
   
13,680,472
     
12,766,003
     
10,499,841