Note 7 - Business Segment Information (Details) - Selected Financial Information on the Company’s Business Segments (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	May 13, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total revenue	$ 27,088,157	$ 23,602,037	$ 50,829,668	$ 46,932,719
Net interest income	15,708,052	14,515,493	29,899,369	28,718,946
Net income attributable to QCR Holdings, Inc.	4,045,231	3,072,156	7,310,375	6,308,974
Total assets	2,446,771,477	2,043,425,746	2,446,771,477	2,043,425,746		2,093,730,492
Provision for loan/lease losses	1,520,137	1,048,469	2,577,919	1,828,915
Goodwill	3,222,688	3,222,688	3,222,688	3,222,688		3,222,688
Cored deposit intangible	3,440,076		3,440,076		1,400,000
Intercompany Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	6,439,309	4,379,005	11,171,879	8,990,997
Net interest income	(388,830)	(371,609)	(739,010)	(757,903)
Net income attributable to QCR Holdings, Inc.	4,045,231	3,110,821	7,310,375	6,407,185
Total assets	211,484,709	194,399,498	211,484,709	194,399,498
Quad City Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	11,810,586	11,936,569	23,866,247	24,201,602
Net interest income	8,485,092	8,532,585	16,876,630	16,921,627
Net income attributable to QCR Holdings, Inc.	1,951,271	2,327,046	4,448,296	5,016,730
Total assets	1,226,928,751	1,157,927,167	1,226,928,751	1,157,927,167
Provision for loan/lease losses	1,020,123	392,469	1,377,905	787,915
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	6,468,480	6,536,887	13,396,831	13,123,036
Net interest income	3,951,787	3,896,184	7,796,669	7,664,183
Net income attributable to QCR Holdings, Inc.	1,624,472	1,413,869	3,345,283	2,681,135
Total assets	619,443,210	581,059,340	619,443,210	581,059,340
Provision for loan/lease losses	100,000	225,000	400,000	575,000
Rockford Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	3,649,811	3,648,057	6,833,870	6,768,852
Net interest income	2,434,391	2,458,333	4,739,468	4,891,039
Net income attributable to QCR Holdings, Inc.	719,480	402,494	815,722	795,969
Total assets	333,996,843	301,189,716	333,996,843	301,189,716
Provision for loan/lease losses	400,000	431,000	800,000	466,000
Wealth Management [Member]
Segment Reporting Information [Line Items]
Total revenue	1,672,243		1,672,243
Net interest income	1,225,612		1,225,612
Net income attributable to QCR Holdings, Inc.	239,902		239,902
Total assets	277,425,832		277,425,832
Provision for loan/lease losses	14		14
Cored deposit intangible	3,440,076		3,440,076
All Other [Member]
Segment Reporting Information [Line Items]
Total revenue	1,728,074	1,531,560	3,377,085	2,936,754
Net income attributable to QCR Holdings, Inc.	232,035	156,523	445,042	316,406
Consolidated [Member]
Segment Reporting Information [Line Items]
Total revenue	(4,680,346)	(4,430,041)	(9,488,487)	(9,088,522)
Net income attributable to QCR Holdings, Inc.	(4,767,160)	(4,338,597)	(9,294,245)	(8,908,451)
Total assets	$ (222,507,868)	$ (191,149,975)	$ (222,507,868)	$ (191,149,975)