Note 4 - Earnings Per Share (Details) - Earnings Per Share - Basic and Diluted (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share, Basic and Diluted [Abstract]
Net income (in Dollars)	$ 4,177,889us-gaap_ProfitLoss	$ 3,889,215us-gaap_ProfitLoss
Less: Preferred stock dividends (in Dollars)		708,008
Net income attributable to QCR Holdings, Inc. common stockholders (in Dollars)	$ 4,177,889	$ 3,181,207
Earnings per common share attributable to QCR Holdings, Inc. common stockholders
Basic (in Dollars per share)	$ 0.52us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share)	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding	7,975,910	7,901,035
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan	121,534	129,008
Weighted average common and common equivalent shares outstanding	8,097,444	8,030,043

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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