Note 5 - Business Segment Information (Details) - Selected Financial Information on the Company’s Business Segments (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenue	$ 25,782,052	$ 23,741,511
Net interest income	16,849,241	14,191,317
Net income attributable to QCR Holdings, Inc.	3,889,215	3,265,144
Total assets	2,426,319,210	2,143,990,652	2,394,952,924
Provision for loan/lease losses	1,094,162	1,057,782
Goodwill	3,222,688	3,222,688	3,222,688
Core deposit intangible	1,820,555		1,870,433
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	(5,315,781)	(4,808,141)
Net income attributable to QCR Holdings, Inc.	(5,206,386)	(4,527,085)
Total assets	(211,998,694)	(200,650,364)
Quad City Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	11,938,133	12,055,661
Net interest income	8,921,038	8,391,538
Net income attributable to QCR Holdings, Inc.	2,341,283	2,497,025
Total assets	1,269,106,354	1,223,662,809
Provision for loan/lease losses	609,162	357,782
Goodwill	3,222,688	3,222,688
Cedar Rapids Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	8,303,625	6,928,351
Net interest income	5,902,059	3,844,882
Net income attributable to QCR Holdings, Inc.	1,934,770	1,720,811
Total assets	819,179,681	598,842,406
Provision for loan/lease losses	300,000	300,000
Core deposit intangible	1,820,555
Rockford Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	3,482,876	3,184,059
Net interest income	2,475,682	2,305,077
Net income attributable to QCR Holdings, Inc.	471,039	96,242
Total assets	346,365,023	322,544,243
Provision for loan/lease losses	185,000	400,000
Wealth Management [Member]
Segment Reporting Information [Line Items]
Total revenue	2,149,334	1,649,011
Net income attributable to QCR Holdings, Inc.	459,294	213,007
All Other [Member]
Segment Reporting Information [Line Items]
Total revenue	5,223,865	4,732,570
Net interest income	(449,538)	(350,180)
Net income attributable to QCR Holdings, Inc.	3,889,215	3,265,144
Total assets	$ 203,666,846	$ 199,591,558