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Note 17 - Earnings Per Share (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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