Note 4 - Earnings Per Share (Detail) - Earnings Per Share - Basic and Diluted (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 3,265,144	$ 3,402,849
Less: Net income attributable to noncontrolling interests		166,031
Net income attributable to QCR Holdings, Inc.	3,265,144	3,236,818
Less: Preferred stock dividends	810,837	938,625
Net income attributable to QCR Holdings, Inc. common stockholders	$ 2,454,307	$ 2,298,193
Earnings per common share attributable to QCR Holdings, Inc. common stockholders
Basic (in Dollars per share)	$ 0.50	$ 0.48
Diluted (in Dollars per share)	$ 0.49	$ 0.48
Weighted average common shares outstanding (in Shares)	4,927,591	4,800,407
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan (in Shares)	106,751	32,992
Weighted average common and common equivalent shares outstanding (in Shares)	5,034,342	4,833,399