Note 9 - Earnings Per Share (Details) - Earnings Per Share - Basic and Diluted - USD ($)		3 Months Ended				6 Months Ended
		Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss) (in Dollars)		$ (523,818)	$ 4,177,889	$ 4,007,836	$ 3,889,215	$ 3,654,071	$ 7,897,051
Less: Preferred stock dividends (in Dollars)				373,869			1,081,877
Net income (loss) attributable to QCR Holdings, Inc. common stockholders (in Dollars)		$ (523,818)		$ 3,633,967		$ 3,654,071	$ 6,815,174
Earnings per common share attributable to QCR Holdings, Inc. common stockholders
Basic (in Dollars per share)		$ (0.05)		$ 0.46		$ 0.41	$ 0.86
Diluted (in Dollars per share)		$ (0.05)		$ 0.45		$ 0.40	$ 0.85
Weighted average common shares outstanding*	[1]	9,946,744		7,924,624		8,961,327	7,912,830
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan**	[2]			125,890		137,370	127,449
Weighted average common and common equivalent shares outstanding**	[2]	9,946,744		8,050,514		9,098,697	8,040,279

[1] The increase in weighted average common shares outstanding was primarily due to the common stock issuance discussed in Note 7 to the Consolidated Financial Statements.

[2] In accordance with U.S. GAAP, the common equivalent shares are not considered in the calculation of diluted earnings per share in periods when the numerator is a net loss.