Note 17 - Earnings Per Common Share (Details) - Earnings Per Share - Basic and Diluted (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share, Basic and Diluted [Abstract]
Net income									$ 14,952,537	$ 14,938,245	$ 13,106,240
Less: Net income attributable to noncontrolling interests											488,473
Net income attributable to QCR Holdings, Inc.	2,992,821	4,062,665	4,007,836	3,889,215	3,815,926	3,811,944	4,045,231	3,265,144	14,952,537	14,938,245	12,617,767
Less: Preferred stock dividends									1,081,877	3,168,302	3,496,085	[1]
Net income attributable to QCR Holdings, Inc. common stockholders									$ 13,870,660	$ 11,769,943	$ 9,121,682
Earnings per common share attributable to QCR Holdings, Inc. common stockholders
Basic (in Dollars per share)	$ 0.38	$ 0.51	$ 0.46	$ 0.40	$ 0.51	$ 0.52	$ 0.60	$ 0.50	$ 1.75	$ 2.13	$ 1.88
Diluted (in Dollars per share)	$ 0.37	$ 0.50	$ 0.45	$ 0.40	$ 0.50	$ 0.51	$ 0.59	$ 0.49	$ 1.72	$ 2.08	$ 1.85
Weighted average common shares outstanding (in Shares)									7,925,220	5,531,948	4,844,776
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan * (in Shares)									123,441	114,978	74,783
Weighted average common and common equivalent shares outstanding (in Shares)									8,048,661	5,646,926	4,919,559

[1] Excludes anti-dilutive shares of 124,983, 116,324, and 158,375 at December 31, 2014, 2013 and 2012, respectively.