Note 4 - Earnings Per Share (Details) - Earnings Per Share - Basic and Diluted (USD $)	3 Months Ended						9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share, Basic and Diluted [Abstract]
Net income (in Dollars)	$ 4,062,665	$ 4,007,836	$ 3,889,215	$ 3,811,944	$ 4,045,231	$ 3,265,144	$ 11,959,716	$ 11,122,319
Less: Preferred stock dividends (in Dollars)				810,837			1,081,877	2,432,512
Net income attributable to QCR Holdings, Inc. common stockholders (in Dollars)	$ 4,062,665			$ 3,001,107			$ 10,877,839	$ 8,689,807
Earnings per common share attributable to QCR Holdings, Inc. common stockholders
Basic (in Dollars per share)	$ 0.51			$ 0.52			$ 1.37	$ 1.62
Diluted (in Dollars per share)	$ 0.50			$ 0.51			$ 1.35	$ 1.59
Weighted average common shares outstanding*	7,931,944			5,806,019			7,919,201	5,375,557
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan	122,041			109,260			121,217	106,741
Weighted average common and common equivalent shares outstanding	8,053,985			5,915,279			8,040,418	5,482,298