Note 2 - Acquisition of Community National Bancorporation and Community National Bank (Details) - Unaudited Pro Forma Operating Results (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Unaudited Pro Forma Operating Results [Abstract]
Interest income	$ 21,275,698	$ 22,056,089	$ 42,364,836	$ 43,963,029
Noninterest income	5,511,338	4,885,073	11,339,794	9,472,182
Net income	1,945,117	3,610,172	5,476,700	7,153,770
Net income attributable to QCR Holdings, Inc. common stockholders	$ 1,134,279	$ 2,473,163	$ 3,855,025	$ 4,912,105
Earnings per common share attributable to QCR Holdings, Inc. common stockholders
Basic (in Dollars per share)	$ 0.21	$ 0.46	$ 0.71	$ 0.91
Diluted (in Dollars per share)	$ 0.21	$ 0.45	$ 0.70	$ 0.89