Note 5 - Business Segment Information (Details) - Selected Financial Information on the Company’s Business Segments (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenue	$ 26,449,589	$ 27,088,157	$ 52,231,641	$ 50,829,668
Net interest income	16,965,343	15,708,052	33,814,584	29,899,369
Net income attributable to QCR Holdings, Inc.	4,007,836	4,045,231	7,897,051	7,310,375
Total assets	2,464,839,483	2,446,771,477	2,464,839,483	2,446,771,477	2,394,952,924
Provision for loan/lease losses	1,001,879	1,520,137	2,096,041	2,577,919
Goodwill	3,222,688	3,222,688	3,222,688	3,222,688	3,222,688
Core Deposit Intangible	1,770,677	3,440,076	1,770,677	3,440,076	1,870,433
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	(5,347,439)	(4,680,346)	(10,663,220)	(9,488,487)
Net income attributable to QCR Holdings, Inc.	(5,237,586)	(4,767,160)	(10,443,972)	(9,294,245)
Total assets	(199,192,145)	(222,507,868)	(199,192,145)	(222,507,868)
Quad City Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	11,962,820	11,810,586	23,900,953	23,866,247
Net interest income	9,080,775	8,485,092	18,001,813	16,876,630
Net income attributable to QCR Holdings, Inc.	2,454,422	1,951,271	4,795,705	4,448,296
Total assets	1,278,200,724	1,226,928,751	1,278,200,724	1,226,928,751
Provision for loan/lease losses	560,879	1,020,123	1,170,041	1,377,905
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	8,710,753	8,140,723	17,014,378	15,069,074
Net interest income	5,739,056	5,177,399	11,641,115	9,022,281
Net income attributable to QCR Holdings, Inc.	1,781,987	1,864,374	3,716,757	3,585,185
Total assets	826,278,230	896,869,042	826,278,230	896,869,042
Provision for loan/lease losses	250,000	100,014	550,000	400,014
Core Deposit Intangible	1,770,677	3,440,076	1,770,677	3,440,076
Rockford Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	3,701,841	3,649,811	7,184,717	6,833,870
Net interest income	2,576,734	2,434,391	5,052,416	4,739,468
Net income attributable to QCR Holdings, Inc.	614,264	719,480	1,085,303	815,722
Total assets	351,309,896	333,996,843	351,309,896	333,996,843
Provision for loan/lease losses	191,000	400,000	376,000	800,000
Wealth Management [Member]
Segment Reporting Information [Line Items]
Total revenue	2,155,272	1,728,074	4,304,606	3,377,085
Net income attributable to QCR Holdings, Inc.	386,913	232,035	846,207	445,042
All Other [Member]
Segment Reporting Information [Line Items]
Total revenue	5,266,342	6,439,309	10,490,207	11,171,879
Net interest income	(431,222)	(388,830)	(880,760)	(739,010)
Net income attributable to QCR Holdings, Inc.	4,007,836	4,045,231	7,897,051	7,310,375
Total assets	$ 208,242,778	$ 211,484,709	$ 208,242,778	$ 211,484,709