Note 7 - Business Segment Information (Details) - Selected Financial Information on the Company’s Business Segments (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total revenue	$ 27,930,896	$ 23,604,707	$ 78,760,564	$ 70,537,426
Net interest income	17,310,336	14,629,518	47,209,705	43,348,464
Net income attributable to QCR Holdings, Inc.	3,811,944	3,057,333	11,122,319	9,366,307
Total assets	2,485,714,438	2,023,946,072	2,485,714,438	2,023,946,072	2,093,730,492
Provision for loan/lease losses	1,366,984	1,496,194	3,944,903	3,325,109
Goodwill	3,222,688	3,222,688	3,222,688	3,222,688	3,222,688
Cored deposit intangible	3,311,073		3,311,073
Intercompany Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	5,398,152	4,542,612	16,570,031	13,533,609
Net interest income	(488,633)	(369,625)	(1,227,643)	(1,127,528)
Net income attributable to QCR Holdings, Inc.	3,811,944	3,077,515	11,122,319	9,484,700
Total assets	214,875,126	196,448,244	214,875,126	196,448,244
Quad City Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	12,610,738	11,643,674	36,476,985	36,196,909
Net interest income	8,494,707	8,602,967	25,371,337	25,524,594
Net income attributable to QCR Holdings, Inc.	2,541,293	2,586,303	6,989,589	7,603,033
Total assets	1,248,417,915	1,134,296,418	1,248,417,915	1,134,296,418
Provision for loan/lease losses	674,984	350,194	2,052,889	1,138,109
Goodwill	3,222,688	3,222,688	3,222,688	3,222,688
Cedar Rapids Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	6,614,689	6,706,485	20,011,520	19,829,521
Net interest income	4,100,494	4,027,693	11,897,163	11,691,876
Net income attributable to QCR Holdings, Inc.	1,626,220	1,532,946	4,971,503	4,214,081
Total assets	651,239,436	587,057,961	651,239,436	587,057,961
Provision for loan/lease losses		300,000	400,000	875,000
Rockford Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	3,457,684	2,897,098	10,291,554	9,665,950
Net interest income	2,421,255	2,368,483	7,160,723	7,259,522
Net income attributable to QCR Holdings, Inc.	445,521	(313,019)	1,261,243	482,950
Total assets	333,804,180	299,947,837	333,804,180	299,947,837
Provision for loan/lease losses	112,000	846,000	912,000	1,312,000
Wealth Management [Member]
Segment Reporting Information [Line Items]
Total revenue	3,391,981		4,900,023
Net interest income	2,782,513		4,008,125
Net income attributable to QCR Holdings, Inc.	315,587		458,786
Total assets	276,428,086		276,428,086
Provision for loan/lease losses	580,000		580,014
Cored deposit intangible	3,311,073		3,311,073
All Other [Member]
Segment Reporting Information [Line Items]
Total revenue	1,946,795	1,490,297	5,488,081	4,427,051
Net income attributable to QCR Holdings, Inc.	458,813	108,950	1,000,558	425,356
Consolidated [Member]
Segment Reporting Information [Line Items]
Total revenue	(5,489,143)	(3,675,459)	(14,977,630)	(13,115,614)
Net income attributable to QCR Holdings, Inc.	(5,387,434)	(3,935,362)	(14,681,679)	(12,843,813)
Total assets	$ (239,050,305)	$ (193,804,388)	$ (239,050,305)	$ (193,804,388)