Note 4 - Earnings Per Share (Details) - Earnings Per Share - Basic and Diluted (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share - Basic and Diluted [Abstract]
Net income	$ 4,007,836	$ 3,889,215	$ 4,045,231	$ 3,265,144	$ 7,897,051	$ 7,310,375
Less: Preferred stock dividends	373,869		810,838		1,081,877	1,621,675
Net income attributable to QCR Holdings, Inc. common stockholders	$ 3,633,967		$ 3,234,393		$ 6,815,174	$ 5,688,700
Earnings per common share attributable to QCR Holdings, Inc. common stockholders
Basic	$ 0.46		$ 0.60		$ 0.86	$ 1.10
Diluted	$ 0.45		$ 0.59		$ 0.85	$ 1.08
Weighted average common shares outstanding	7,924,624		5,393,062		7,912,830	5,160,327
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan	125,890		104,213		127,449	105,482
Weighted average common and common equivalent shares outstanding	8,050,514		5,497,275		8,040,279	5,265,809