Note 6 - Earnings Per Share (Details) - Earnings Per Share - Basic and Diluted (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share - Basic and Diluted [Abstract]
Net income	$ 4,045,231	$ 3,265,144	$ 3,273,379	$ 3,402,849	$ 7,310,375	$ 6,676,228
Less: Net income attributable to noncontrolling interests			201,223			367,254
Net income attributable to QCR Holdings, Inc.	4,045,231		3,072,156		7,310,375	6,308,974
Less: Preferred stock dividends	810,838		935,786		1,621,675	1,874,411
Net income attributable to QCR Holdings, Inc. common stockholders	$ 3,234,393		$ 2,136,370		$ 5,688,700	$ 4,434,563
Earnings per common share attributable to QCR Holdings, Inc. common stockholders
Basic (in Dollars per share)	$ 0.60		$ 0.44		$ 1.10	$ 0.92
Diluted (in Dollars per share)	$ 0.59		$ 0.44		$ 1.08	$ 0.91
Weighted average common shares outstanding (in Shares)	5,393,062		4,835,773		5,160,327	4,818,090
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan (in Shares)	104,213		66,080		105,482	49,538
Weighted average common and common equivalent shares outstanding (in Shares)	5,497,275		4,901,853		5,265,809	4,867,628