Note 5 - DERIVATIVES AND HEDGING ACTIVITIES - Summary of Hedged Interest Rate Swap and Cap Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Derivative Assets	$ 183,888	$ 187,341
Derivative Liabilities	(211,677)	(215,735)
Hedged Derivatives | Cash Flow Hedges | Interest rate swaps
Derivative Asset, Notional Amount	114,310
Derivative Liability, Notional Amount	300,000
Derivative Assets	2,437	1,689
Derivative Liabilities	(34,183)	(30,407)
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Subordinated Note
Derivative Asset, Notional Amount	$ 65,000
Receive Rate	5.34%
Pay Rate	4.02%
Derivative Assets	$ 21
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust II
Derivative Asset, Notional Amount	$ 10,000
Receive Rate	8.44%
Pay Rate	5.85%
Derivative Assets	$ 512	341
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust III
Derivative Asset, Notional Amount	$ 8,000
Receive Rate	8.44%
Pay Rate	5.85%
Derivative Assets	$ 409	272
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust V
Derivative Asset, Notional Amount	$ 10,000
Receive Rate	7.14%
Pay Rate	4.54%
Derivative Assets	$ 500	335
Hedged Derivatives | Cash Flow Hedges | Community National Statutory Trust II
Derivative Asset, Notional Amount	$ 3,000
Receive Rate	7.76%
Pay Rate	5.17%
Derivative Assets	$ 153	101
Hedged Derivatives | Cash Flow Hedges | Community National Statutory Trust III
Derivative Asset, Notional Amount	$ 3,500
Receive Rate	7.34%
Pay Rate	4.75%
Derivative Assets	$ 178	118
Hedged Derivatives | Cash Flow Hedges | Guaranty Bankshares Statutory Trust I
Derivative Asset, Notional Amount	$ 4,500
Receive Rate	7.34%
Pay Rate	4.75%
Derivative Assets	$ 229	152
Hedged Derivatives | Cash Flow Hedges | Guaranty Statutory Trust II
Derivative Asset, Notional Amount	$ 10,310
Receive Rate	7.03%
Pay Rate	4.09%
Derivative Assets	$ 435	370
Hedged Derivatives | Cash Flow Hedges | Loans, one
Derivative Liability, Notional Amount	$ 35,000
Receive Rate	1.40%
Pay Rate	5.44%
Derivative Liabilities	$ (5,605)	(5,004)
Hedged Derivatives | Cash Flow Hedges | Loans, two
Derivative Liability, Notional Amount	$ 50,000
Receive Rate	1.40%
Pay Rate	5.44%
Derivative Liabilities	$ (8,007)	(7,149)
Hedged Derivatives | Cash Flow Hedges | Loans, three
Derivative Liability, Notional Amount	$ 40,000
Receive Rate	1.40%
Pay Rate	5.44%
Derivative Liabilities	$ (6,416)	(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	$ (4,035)	(3,696)
Hedged Derivatives | Cash Flow Hedges | Loan five
Derivative Liability, Notional Amount	$ 15,000
Receive Rate	1.91%
Pay Rate	5.44%
Derivative Liabilities	$ (1,012)	(868)
Hedged Derivatives | Cash Flow Hedges | Loan six
Derivative Liability, Notional Amount	$ 50,000
Receive Rate	1.91%
Pay Rate	5.44%
Derivative Liabilities	$ (3,373)	(2,892)
Hedged Derivatives | Cash Flow Hedges | Loan seven
Derivative Liability, Notional Amount	$ 35,000
Receive Rate	1.91%
Pay Rate	5.44%
Derivative Liabilities	$ (2,361)	(2,024)
Hedged Derivatives | Cash Flow Hedges | Loan eight
Derivative Liability, Notional Amount	$ 50,000
Receive Rate	1.91%
Pay Rate	5.44%
Derivative Liabilities	$ (3,374)	(3,044)
Hedged Derivatives | Cash Flow Hedges | Interest rate caps
Derivative Asset, Notional Amount	200,000
Derivative Assets	2,561	2,847
Hedged Derivatives | Cash Flow Hedges | Deposits, one
Derivative Asset, Notional Amount	$ 25,000
Derivative Assets		(79)
Hedged Derivatives | Cash Flow Hedges | Deposits, one | London Interbank Offered Rate (LIBOR)
Strike Rate	1.75%
Hedged Derivatives | Cash Flow Hedges | Deposits, two
Derivative Asset, Notional Amount	$ 50,000
Hedged Derivatives | Cash Flow Hedges | Deposits, two | London Interbank Offered Rate (LIBOR)
Strike Rate	1.57%
Hedged Derivatives | Cash Flow Hedges | Deposits, three
Derivative Asset, Notional Amount	$ 25,000
Hedged Derivatives | Cash Flow Hedges | Deposits, three | London Interbank Offered Rate (LIBOR)
Strike Rate	1.80%
Hedged Derivatives | Cash Flow Hedges | Deposits, four
Derivative Asset, Notional Amount	$ 25,000
Derivative Assets	$ 633	672
Hedged Derivatives | Cash Flow Hedges | Deposits, four | London Interbank Offered Rate (LIBOR)
Strike Rate	1.75%
Hedged Derivatives | Cash Flow Hedges | Deposits, five
Derivative Asset, Notional Amount	$ 50,000
Derivative Assets	$ 1,285	1,503
Hedged Derivatives | Cash Flow Hedges | Deposits, five | London Interbank Offered Rate (LIBOR)
Strike Rate	1.57%
Hedged Derivatives | Cash Flow Hedges | Deposits, six
Derivative Asset, Notional Amount	$ 25,000
Derivative Assets	$ 643	751
Hedged Derivatives | Cash Flow Hedges | Deposits, six | London Interbank Offered Rate (LIBOR)
Strike Rate	1.80%
Hedged Derivatives | Fair Value Hedges | Interest rate swaps
Notional Amount	$ 325,000
Derivative Assets	1,083
Derivative Liabilities		(3,308)
Hedged Derivatives | Fair Value Hedges | Loan nine
Notional Amount	$ 25,000
Receive Rate	5.33%
Pay Rate	4.38%
Derivative Assets	$ 61
Derivative Liabilities		(195)
Hedged Derivatives | Fair Value Hedges | Loan ten
Notional Amount	$ 30,000
Receive Rate	5.33%
Pay Rate	4.21%
Derivative Assets	$ 87
Derivative Liabilities		(293)
Hedged Derivatives | Fair Value Hedges | Loan eleven
Notional Amount	$ 32,500
Receive Rate	5.33%
Pay Rate	4.08%
Derivative Assets	$ 107
Derivative Liabilities		(364)
Hedged Derivatives | Fair Value Hedges | Loan twelve
Notional Amount	$ 32,500
Receive Rate	5.33%
Pay Rate	3.98%
Derivative Assets	$ 129
Derivative Liabilities		(397)
Hedged Derivatives | Fair Value Hedges | Loan thirteen
Notional Amount	$ 30,000
Receive Rate	5.33%
Pay Rate	3.90%
Derivative Assets	$ 138
Derivative Liabilities		(388)
Hedged Derivatives | Fair Value Hedges | Loan fourteen
Notional Amount	$ 15,000
Receive Rate	5.33%
Pay Rate	4.38%
Derivative Assets	$ 36
Derivative Liabilities		(117)
Hedged Derivatives | Fair Value Hedges | Loan fifteen
Notional Amount	$ 15,000
Receive Rate	5.33%
Pay Rate	4.21%
Derivative Assets	$ 43
Derivative Liabilities		(146)
Hedged Derivatives | Fair Value Hedges | Loan sixteen
Notional Amount	$ 15,000
Receive Rate	5.33%
Pay Rate	4.08%
Derivative Assets	$ 50
Derivative Liabilities		(168)
Hedged Derivatives | Fair Value Hedges | Loan seventeen
Notional Amount	$ 15,000
Receive Rate	5.33%
Pay Rate	3.98%
Derivative Assets	$ 60
Derivative Liabilities		(183)
Hedged Derivatives | Fair Value Hedges | Loan eighteen
Notional Amount	$ 15,000
Receive Rate	5.33%
Pay Rate	3.90%
Derivative Assets	$ 69
Derivative Liabilities		(194)
Hedged Derivatives | Fair Value Hedges | Loan nineteen
Notional Amount	$ 15,000
Receive Rate	5.33%
Pay Rate	4.60%
Derivative Assets	$ 29
Derivative Liabilities		(69)
Hedged Derivatives | Fair Value Hedges | Loan twenty
Notional Amount	$ 20,000
Receive Rate	5.33%
Pay Rate	4.38%
Derivative Assets	$ 49
Derivative Liabilities		(140)
Hedged Derivatives | Fair Value Hedges | Loan twenty one
Notional Amount	$ 20,000
Receive Rate	5.33%
Pay Rate	4.21%
Derivative Assets	$ 58
Derivative Liabilities		(176)
Hedged Derivatives | Fair Value Hedges | Loan twenty two
Notional Amount	$ 20,000
Receive Rate	5.33%
Pay Rate	4.08%
Derivative Assets	$ 67
Derivative Liabilities		(202)
Hedged Derivatives | Fair Value Hedges | Loan twenty three
Notional Amount	$ 25,000
Receive Rate	5.33%
Pay Rate	3.98%
Derivative Assets	$ 100
Derivative Liabilities		$ (276)