Note 6 - Earnings Per Share (Details) - Earnings Per Share - Basic and Diluted (USD $)	3 Months Ended						9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share - Basic and Diluted [Abstract]
Net income	$ 3,811,944	$ 4,045,231	$ 3,265,144	$ 3,184,510	$ 3,273,379	$ 3,402,849	$ 11,122,319	$ 9,860,738
Less: Net income attributable to noncontrolling interests				127,177				494,431
Net income attributable to QCR Holdings, Inc.	3,811,944			3,057,333			11,122,319	9,366,307
Less: Preferred stock dividends	810,837			810,837			2,432,512	2,685,248
Net income attributable to QCR Holdings, Inc. common stockholders	$ 3,001,107			$ 2,246,496			$ 8,689,807	$ 6,681,059
Earnings per common share attributable to QCR Holdings, Inc. common stockholders
Basic (in Dollars per share)	$ 0.52			$ 0.45			$ 1.62	$ 1.37
Diluted (in Dollars per share)	$ 0.51			$ 0.44			$ 1.59	$ 1.35
Weighted average common shares outstanding (in Shares)	5,806,019			4,978,699			5,375,557	4,871,626
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan (in Shares)	109,260			101,589			106,741	66,888
Weighted average common and common equivalent shares outstanding (in Shares)	5,915,279			5,080,288			5,482,298	4,938,514