Note 2 - Acquisition of Community National Bancorporation and Community National Bank (Details) - Unaudited Pro Forma Operating Results (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Unaudited Pro Forma Operating Results [Abstract]
Interest income	$ 21,394,747	$ 22,106,037	$ 63,759,583	$ 66,069,066
Noninterest income	5,934,653	4,816,132	17,274,447	14,288,314
Net income	3,348,327	3,538,764	8,825,027	10,692,534
Net income attributable to QCR Holdings, Inc. common stockholders	$ 2,537,490	$ 2,600,750	$ 6,392,515	$ 7,512,855
Earnings per common share attributable to QCR Holdings, Inc. common stockholders
Basic (in Dollars per share)	$ 0.44	$ 0.45	$ 1.10	$ 1.29
Diluted (in Dollars per share)	$ 0.43	$ 0.44	$ 1.08	$ 1.27