Note 21 - Business Segment Information (Details) - Selected Financial Information on the Company’s Business Segments (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total revenue	$ 107,685,786	$ 93,997,168	$ 95,185,126
Net interest income	64,105,437	57,649,260	54,144,856
Net income attributable to QCR Holdings, Inc.	14,938,245	12,617,767	9,691,648
Total assets	2,394,952,924	2,093,730,492	1,966,610,054
Provision for loan/lease losses	5,930,420	4,370,767	6,616,014
Goodwill	3,222,688	3,222,688	3,222,688
Core deposit intangible	1,870,433
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	(402,040)	(379,946)	(399,877)
Net income attributable to QCR Holdings, Inc.		(10,752)	(24,327)
Total assets	(16,168,205)	(38,008,739)	(16,111,099)
Quad City Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	48,742,635	47,984,123	47,952,867
Net interest income	33,892,035	33,770,092	30,831,946
Net income attributable to QCR Holdings, Inc.	9,310,779	9,915,267	8,176,665
Total assets	1,245,128,136	1,177,294,502	1,113,435,783
Provision for loan/lease losses	3,391,406	1,527,767	2,735,014
Goodwill	3,222,688	3,222,688	3,222,688
Cedar Rapids Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	36,089,448	26,697,921	28,406,789
Net interest income	22,239,329	15,717,038	15,856,555
Net income attributable to QCR Holdings, Inc.	7,953,230	5,786,446	5,154,769
Total assets	804,223,453	625,713,218	560,076,246
Provision for loan/lease losses	1,531,014	1,275,000	1,655,000
Core deposit intangible	1,870,433
Rockford Bank and Trust [Member]
Segment Reporting Information [Line Items]
Total revenue	13,809,593	12,955,951	13,518,534
Net interest income	9,645,411	9,630,481	9,085,293
Net income attributable to QCR Holdings, Inc.	1,855,672	857,610	329,251
Total assets	339,375,139	313,824,607	294,382,640
Provision for loan/lease losses	1,008,000	1,568,000	2,226,000
Wealth Management [Member]
Segment Reporting Information [Line Items]
Total revenue	7,521,821	5,993,437	5,477,913
Net income attributable to QCR Holdings, Inc.	1,379,402	646,762	789,159
All Other [Member]
Segment Reporting Information [Line Items]
Total revenue	1,924,329	745,682	228,900
Net interest income	(1,671,338)	(1,468,351)	(1,628,938)
Net income attributable to QCR Holdings, Inc.	(5,560,838)	(4,577,566)	(4,733,869)
Total assets	$ 22,394,401	$ 14,906,904	$ 14,826,484