Note 5 - Business Segment Information (Details) - Selected Financial Information on the Company’s Business Segments (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenue	$ 26,864,284	$ 27,930,896	$ 79,095,925	$ 78,760,564
Net interest income	17,475,331	17,310,336	51,289,915	47,209,705
Net income attributable to QCR Holdings, Inc.	4,062,665	3,811,944	11,959,716	11,122,319
Total assets	2,450,595,553	2,485,714,438	2,450,595,553	2,485,714,438	2,394,952,924
Provision for loan/lease losses	1,063,323	1,366,984	3,159,364	3,944,903
Goodwill	3,222,688	3,222,688	3,222,688	3,222,688	3,222,688
Core deposit intangible	1,720,799	3,311,073	1,720,799	3,311,073	1,870,433
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	(5,609,315)	(5,489,143)	(16,272,535)	(14,977,630)
Net income attributable to QCR Holdings, Inc.	(5,492,285)	(5,387,434)	(15,936,257)	(14,681,679)
Total assets	(204,813,887)	(239,050,305)	(204,813,887)	(239,050,305)
Quad City Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	12,467,712	12,610,738	36,368,665	36,476,985
Net interest income	9,234,089	8,494,707	27,235,902	25,371,337
Net income attributable to QCR Holdings, Inc.	2,602,238	2,541,293	7,397,943	6,989,589
Total assets	1,274,033,270	1,248,417,915	1,274,033,270	1,248,417,915
Provision for loan/lease losses	609,657	674,984	1,779,698	2,052,889
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	8,801,737	10,006,670	25,816,115	24,911,543
Net interest income	6,179,763	6,883,007	17,820,878	15,905,288
Net income attributable to QCR Holdings, Inc.	1,861,236	1,941,807	5,577,993	5,430,289
Total assets	822,348,680	927,667,522	822,348,680	927,667,522
Provision for loan/lease losses	331,666	580,000	881,666	980,014
Core deposit intangible	1,720,799	3,311,073	1,720,799	3,311,073
Rockford Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	3,595,245	3,457,684	10,779,962	10,291,554
Net interest income	2,584,613	2,421,255	7,637,029	7,160,723
Net income attributable to QCR Holdings, Inc.	669,814	445,521	1,755,117	1,261,243
Total assets	346,791,265	333,804,180	346,791,265	333,804,180
Provision for loan/lease losses	122,000	112,000	498,000	912,000
Wealth Management [Member]
Segment Reporting Information [Line Items]
Total revenue	2,082,609	1,946,795	6,387,215	5,488,081
Net income attributable to QCR Holdings, Inc.	358,997	458,813	1,205,204	1,000,558
All Other [Member]
Segment Reporting Information [Line Items]
Total revenue	5,526,296	5,398,152	16,016,503	16,570,031
Net interest income	(523,134)	(488,633)	(1,403,894)	(1,227,643)
Net income attributable to QCR Holdings, Inc.	4,062,665	3,811,944	11,959,716	11,122,319
Total assets	$ 212,236,225	$ 214,875,126	$ 212,236,225	$ 214,875,126