Note 4 - DERIVATIVES AND HEDGING ACTIVITIES - Summary of Interest Rate Cap Derivatives (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Derivative Assets	$ 291,295	$ 177,631
Derivative Liabilities	(320,220)	(200,701)
Hedged Derivatives | Cash Flow Hedges
Notional Amount	49,310
Derivative Assets	3,334	2,284
Derivative Liabilities	(42,095)	(35,631)
Hedged Derivatives | Cash Flow Hedges | Deposits, one
Notional Amount	$ 25,000
Derivative Liabilities		(50)
Hedged Derivatives | Cash Flow Hedges | Deposits, one | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.75%
Hedged Derivatives | Cash Flow Hedges | Deposits, two
Notional Amount	$ 25,000
Derivative Assets	$ 157	714
Hedged Derivatives | Cash Flow Hedges | Deposits, two | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.75%
Hedged Derivatives | Cash Flow Hedges | Deposits, three
Notional Amount	$ 50,000
Derivative Assets	$ 474	1,566
Hedged Derivatives | Cash Flow Hedges | Deposits, three | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.57%
Hedged Derivatives | Cash Flow Hedges | Deposits, four
Notional Amount	$ 25,000
Derivative Assets	$ 237	783
Hedged Derivatives | Cash Flow Hedges | Deposits, four | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.80%
Hedged Derivatives | Cash Flow Hedges | Deposits, five
Notional Amount	$ 25,000
Derivative Assets	$ 1,010	1,264
Hedged Derivatives | Cash Flow Hedges | Deposits, five | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.75%
Hedged Derivatives | Cash Flow Hedges | Deposits, six
Notional Amount	$ 50,000
Derivative Assets	$ 2,212	2,700
Hedged Derivatives | Cash Flow Hedges | Deposits, six | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.57%
Hedged Derivatives | Cash Flow Hedges | Deposits, seven
Notional Amount	$ 25,000
Derivative Assets	$ 1,106	1,350
Hedged Derivatives | Cash Flow Hedges | Deposits, seven | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.80%
Hedged Derivatives | Cash Flow Hedges | Interest rate swaps
Derivative Assets	$ 3,334	477
Derivative Liabilities	(42,095)	(33,824)
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust II
Notional Amount	$ 10,000
Receive Rate	8.51%
Pay Rate	5.85%
Derivative Assets	$ 710	464
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust III
Notional Amount	$ 8,000
Receive Rate	8.51%
Pay Rate	5.85%
Derivative Assets	$ 568	372
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust V
Notional Amount	$ 10,000
Receive Rate	7.12%
Pay Rate	4.54%
Derivative Assets	$ 691	459
Hedged Derivatives | Cash Flow Hedges | Community National Statutory Trust II
Notional Amount	$ 3,000
Receive Rate	7.83%
Pay Rate	5.17%
Derivative Assets	$ 212	140
Hedged Derivatives | Cash Flow Hedges | Community National Statutory Trust III
Notional Amount	$ 3,500
Receive Rate	7.42%
Pay Rate	4.75%
Derivative Assets	$ 247	163
Hedged Derivatives | Cash Flow Hedges | Guaranty Bankshares Statutory Trust I
Notional Amount	$ 4,500
Receive Rate	7.42%
Pay Rate	4.75%
Derivative Assets	$ 318	209
Hedged Derivatives | Cash Flow Hedges | Guaranty Statutory Trust II
Notional Amount	$ 10,310
Receive Rate	7.09%
Pay Rate	4.09%
Derivative Assets	$ 588	477
Hedged Derivatives | Cash Flow Hedges | Loans, one
Receive Rate	1.40%
Pay Rate	5.31%
Derivative Liabilities	$ (6,776)	(5,646)
Hedged Derivatives | Cash Flow Hedges | Loans, two
Receive Rate	1.40%
Pay Rate	5.31%
Derivative Liabilities	$ (9,680)	(8,066)
Hedged Derivatives | Cash Flow Hedges | Loans, three
Receive Rate	1.40%
Pay Rate	5.31%
Derivative Liabilities	$ (7,755)	(6,464)
Hedged Derivatives | Cash Flow Hedges | Loans, four
Receive Rate	1.30%
Pay Rate	5.31%
Derivative Liabilities	$ (4,877)	(4,018)
Hedged Derivatives | Cash Flow Hedges | Loan five
Receive Rate	1.91%
Pay Rate	5.31%
Derivative Liabilities	$ (1,301)	(1,144)
Hedged Derivatives | Cash Flow Hedges | Loan six
Receive Rate	1.91%
Pay Rate	5.31%
Derivative Liabilities	$ (4,335)	(3,812)
Hedged Derivatives | Cash Flow Hedges | Loan seven
Receive Rate	1.91%
Pay Rate	5.31%
Derivative Liabilities	$ (3,035)	(2,669)
Hedged Derivatives | Cash Flow Hedges | Loan eight
Receive Rate	1.91%
Pay Rate	5.31%
Derivative Liabilities	$ (4,336)	(3,812)
Hedged Derivatives | Cash Flow Hedges | Interest rate caps
Notional Amount	225,000
Derivative Assets	5,196	8,327
Derivative Assets (Liabilities)		8,327
Hedged Derivatives | Derivative Assets.
Notional Amount	325,000
Fair Value - Asset	3,977
Hedged Derivatives | Derivative Assets. | Loan nine
Notional Amount	$ 25,000
Receive Rate	5.31%
Pay Rate	4.38%
Fair Value - Asset	$ 204
Hedged Derivatives | Derivative Assets. | Loan ten
Notional Amount	$ 30,000
Receive Rate	5.31%
Pay Rate	4.21%
Fair Value - Asset	$ 304
Hedged Derivatives | Derivative Assets. | Loan eleven
Notional Amount	$ 32,500
Receive Rate	5.31%
Pay Rate	4.08%
Fair Value - Asset	$ 409
Hedged Derivatives | Derivative Assets. | Loan twelve
Notional Amount	$ 32,500
Receive Rate	5.31%
Pay Rate	3.98%
Fair Value - Asset	$ 488
Hedged Derivatives | Derivative Assets. | Loan thirteen
Notional Amount	$ 30,000
Receive Rate	5.31%
Pay Rate	3.90%
Fair Value - Asset	$ 532
Hedged Derivatives | Derivative Assets. | Loan fourteen
Notional Amount	$ 15,000
Receive Rate	5.31%
Pay Rate	4.38%
Fair Value - Asset	$ 123
Hedged Derivatives | Derivative Assets. | Loan fifteen
Notional Amount	$ 15,000
Receive Rate	5.31%
Pay Rate	4.21%
Fair Value - Asset	$ 152
Hedged Derivatives | Derivative Assets. | Loan sixteen
Notional Amount	$ 15,000
Receive Rate	5.31%
Pay Rate	4.08%
Fair Value - Asset	$ 189
Hedged Derivatives | Derivative Assets. | Loan seventeen
Notional Amount	$ 15,000
Receive Rate	5.31%
Pay Rate	3.98%
Fair Value - Asset	$ 225
Hedged Derivatives | Derivative Assets. | Loan eighteen
Notional Amount	$ 15,000
Receive Rate	5.31%
Pay Rate	3.90%
Fair Value - Asset	$ 267
Hedged Derivatives | Derivative Assets. | Loan nineteen
Notional Amount	$ 15,000
Receive Rate	5.31%
Pay Rate	4.60%
Fair Value - Asset	$ 90
Hedged Derivatives | Derivative Assets. | Loan twenty
Notional Amount	$ 20,000
Receive Rate	5.31%
Pay Rate	4.38%
Fair Value - Asset	$ 163
Hedged Derivatives | Derivative Assets. | Loan twenty one
Notional Amount	$ 20,000
Receive Rate	5.31%
Pay Rate	4.21%
Fair Value - Asset	$ 203
Hedged Derivatives | Derivative Assets. | Loan twenty two
Notional Amount	$ 20,000
Receive Rate	5.31%
Pay Rate	4.08%
Fair Value - Asset	$ 252
Hedged Derivatives | Derivative Assets. | Loan twenty three
Notional Amount	$ 25,000
Receive Rate	5.31%
Pay Rate	3.98%
Fair Value - Asset	$ 376
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges
Notional Amount	300,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loans, one
Notional Amount	35,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loans, two
Notional Amount	50,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loans, three
Notional Amount	40,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loans, four
Notional Amount	25,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loan five
Notional Amount	15,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loan six
Notional Amount	50,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loan seven
Notional Amount	35,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loan eight
Notional Amount	50,000
Unhedged Derivatives
Notional Amount	75,000
Unhedged Derivatives | Deposits, one
Notional Amount	25,000
Unhedged Derivatives | Deposits, two
Notional Amount	25,000
Unhedged Derivatives | Deposits, five
Notional Amount	25,000
Unhedged Derivatives | Interest rate swaps
Derivative Assets	277,255	166,614
Derivative Liabilities	(277,255)	(166,614)
Unhedged Derivatives | Interest rate caps
Derivative Assets	$ 1,533	$ 2,213