Note 5 - DERIVATIVES AND HEDGING ACTIVITIES - Summary of Hedged Interest Rate Swap and Cap Derivatives (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Derivative Asset	$ 261,913	$ 187,341
Derivative Liabilities	(285,769)	(215,735)
Hedged Derivatives | Cash Flow Hedges | Interest rate swaps
Derivative Liability, Notional Amount	300,000
Derivative, Notional Amount	114,310
Derivative Asset	958	1,689
Derivative Liabilities	(25,060)	(30,407)
Derivative Assets (Liabilities), net	(624)
Derivative Liabilities	(23,478)
Derivative Assets (Liabilities)		1,689
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust V
Derivative Asset, Notional Amount	$ 10,000
Receive Rate	5.37%
Pay Rate	4.54%
Derivative Asset	$ 190	335
Hedged Derivatives | Cash Flow Hedges | Community National Statutory Trust III
Derivative Asset, Notional Amount	$ 3,500
Receive Rate	6.96%
Pay Rate	4.75%
Derivative Asset	$ 87	118
Hedged Derivatives | Cash Flow Hedges | Guaranty Bankshares Statutory Trust I
Derivative Asset, Notional Amount	$ 4,500
Receive Rate	6.96%
Pay Rate	4.75%
Derivative Asset	$ 68	152
Hedged Derivatives | Cash Flow Hedges | Community National Statutory Trust II
Derivative Asset, Notional Amount	$ 3,000
Receive Rate	7.25%
Pay Rate	5.17%
Derivative Asset	$ 58	101
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust II
Derivative Asset, Notional Amount	$ 10,000
Receive Rate	7.72%
Pay Rate	5.85%
Derivative Asset	$ 194	341
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust III
Derivative Asset, Notional Amount	$ 8,000
Receive Rate	7.72%
Pay Rate	5.85%
Derivative Asset	$ 155	272
Hedged Derivatives | Cash Flow Hedges | Guaranty Statutory Trust II
Derivative Asset, Notional Amount	$ 10,310
Receive Rate	6.81%
Pay Rate	4.09%
Derivative Asset	$ 206	370
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Subordinated Note
Derivative Liability, Notional Amount	$ 65,000
Receive Rate	5.34%
Pay Rate	4.02%
Derivative Liabilities	$ 1,582
Hedged Derivatives | Cash Flow Hedges | Loans, one
Derivative Liability, Notional Amount	$ 35,000
Receive Rate	1.40%
Pay Rate	5.33%
Derivative Liabilities	$ (4,167)	(5,004)
Hedged Derivatives | Cash Flow Hedges | Loans, two
Derivative Liability, Notional Amount	$ 50,000
Receive Rate	1.40%
Pay Rate	5.33%
Derivative Liabilities	$ (5,952)	(7,149)
Hedged Derivatives | Cash Flow Hedges | Loans, three
Derivative Liability, Notional Amount	$ 40,000
Receive Rate	1.40%
Pay Rate	5.33%
Derivative Liabilities	$ (4,772)	(5,730)
Hedged Derivatives | Cash Flow Hedges | Loans, four
Derivative Liability, Notional Amount	$ 25,000
Receive Rate	1.30%
Pay Rate	5.33%
Derivative Liabilities	$ (3,005)	(3,696)
Hedged Derivatives | Cash Flow Hedges | Loan five
Derivative Liability, Notional Amount	$ 15,000
Receive Rate	1.91%
Pay Rate	5.33%
Derivative Liabilities	$ (558)	(868)
Hedged Derivatives | Cash Flow Hedges | Loan six
Derivative Liability, Notional Amount	$ 50,000
Receive Rate	1.91%
Pay Rate	5.33%
Derivative Liabilities	$ (1,861)	(2,892)
Hedged Derivatives | Cash Flow Hedges | Loan seven
Derivative Liability, Notional Amount	$ 35,000
Receive Rate	1.91%
Pay Rate	5.33%
Derivative Liabilities	$ (1,303)	(2,024)
Hedged Derivatives | Cash Flow Hedges | Loan eight
Derivative Liability, Notional Amount	$ 50,000
Receive Rate	1.91%
Pay Rate	5.33%
Derivative Liabilities	$ (1,860)	(3,044)
Hedged Derivatives | Cash Flow Hedges | Interest rate caps
Derivative Asset, Notional Amount	200,000
Derivative Asset	753	2,847
Hedged Derivatives | Cash Flow Hedges | Deposits, one
Derivative Asset, Notional Amount	$ 25,000
Strike Rate	1.75%
Derivative Asset		(79)
Hedged Derivatives | Cash Flow Hedges | Deposits, two
Derivative Asset, Notional Amount	$ 50,000
Strike Rate	1.57%
Hedged Derivatives | Cash Flow Hedges | Deposits, three
Derivative Asset, Notional Amount	$ 25,000
Strike Rate	1.80%
Hedged Derivatives | Cash Flow Hedges | Deposits, four
Derivative Asset, Notional Amount	$ 25,000
Strike Rate	1.75%
Derivative Asset	$ 188	672
Hedged Derivatives | Cash Flow Hedges | Deposits, five
Derivative Asset, Notional Amount	$ 50,000
Strike Rate	1.57%
Derivative Asset	$ 376	1,503
Hedged Derivatives | Cash Flow Hedges | Deposits, six
Derivative Asset, Notional Amount	$ 25,000
Strike Rate	1.80%
Derivative Asset	$ 189	751
Hedged Derivatives | Fair Value Hedges | Interest rate swaps
Derivative, Notional Amount	325,000
Derivative Asset	(4,969)
Derivative Liabilities	(4,969)	(3,308)
Hedged Derivatives | Fair Value Hedges | Loan Nine
Derivative, Notional Amount	$ 15,000
Receive Rate	5.15%
Pay Rate	4.60%
Derivative Asset	$ (83)
Derivative Liabilities		(69)
Hedged Derivatives | Fair Value Hedges | Loan Eleven
Derivative, Notional Amount	$ 15,000
Receive Rate	5.15%
Pay Rate	4.38%
Derivative Asset	$ (151)
Derivative Liabilities		(117)
Hedged Derivatives | Fair Value Hedges | Loan Twelve
Derivative, Notional Amount	$ 20,000
Receive Rate	5.15%
Pay Rate	4.38%
Derivative Asset	$ (202)
Derivative Liabilities		(140)
Hedged Derivatives | Fair Value Hedges | Loan Thirteen
Derivative, Notional Amount	$ 30,000
Receive Rate	5.15%
Pay Rate	4.21%
Derivative Asset	$ (413)
Derivative Liabilities		(293)
Hedged Derivatives | Fair Value Hedges | Loan fourteen
Derivative, Notional Amount	$ 15,000
Receive Rate	5.15%
Pay Rate	4.21%
Derivative Asset	$ (207)
Derivative Liabilities		(146)
Hedged Derivatives | Fair Value Hedges | Loan fifteen
Derivative, Notional Amount	$ 20,000
Receive Rate	5.15%
Pay Rate	4.21%
Derivative Asset	$ (276)
Derivative Liabilities		(176)
Hedged Derivatives | Fair Value Hedges | Loan sixteen
Derivative, Notional Amount	$ 32,500
Receive Rate	5.15%
Pay Rate	4.08%
Derivative Asset	$ (539)
Derivative Liabilities		(364)
Hedged Derivatives | Fair Value Hedges | Loan seventeen
Derivative, Notional Amount	$ 15,000
Receive Rate	5.15%
Pay Rate	4.08%
Derivative Asset	$ (249)
Derivative Liabilities		(168)
Hedged Derivatives | Fair Value Hedges | Loan Eighteen
Derivative, Notional Amount	$ 20,000
Receive Rate	5.15%
Pay Rate	4.08%
Derivative Asset	$ (332)
Derivative Liabilities		(202)
Hedged Derivatives | Fair Value Hedges | Loan Nineteen
Derivative, Notional Amount	$ 32,500
Receive Rate	5.15%
Pay Rate	3.98%
Derivative Asset	$ (606)
Derivative Liabilities		(397)
Hedged Derivatives | Fair Value Hedges | Loan Twenty
Derivative, Notional Amount	$ 15,000
Receive Rate	5.15%
Pay Rate	3.98%
Derivative Asset	$ (280)
Derivative Liabilities		(183)
Hedged Derivatives | Fair Value Hedges | Loan twenty one
Derivative, Notional Amount	$ 25,000
Receive Rate	5.15%
Pay Rate	3.98%
Derivative Asset	$ (466)
Derivative Liabilities		(276)
Hedged Derivatives | Fair Value Hedges | Loan twenty two
Derivative, Notional Amount	$ 30,000
Receive Rate	5.15%
Pay Rate	3.90%
Derivative Asset	$ (609)
Derivative Liabilities		(388)
Hedged Derivatives | Fair Value Hedges | Loan twenty three
Derivative, Notional Amount	$ 15,000
Receive Rate	5.15%
Pay Rate	3.90%
Derivative Asset	$ (304)
Derivative Liabilities		(194)
Hedged Derivatives | Fair Value Hedges | Loan ten
Derivative, Notional Amount	$ 25,000
Receive Rate	5.15%
Pay Rate	4.38%
Derivative Asset	$ (252)
Derivative Liabilities		$ (195)