NOTE 4 - DERIVATIVES - Summary of Interest Rate Swaps Derivatives (Details) - Designated as Hedging Instrument [Member] - Other Liabilities. - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Interest rate swap
Notional Amount	$ 39,000
Fair Value - Liability	$ (2,151)	$ (1,151)
Receive Rate	4.89%
Pay Rate	5.24%
QCR Holdings Statutory Trust II
Notional Amount	$ 10,000
Fair Value - Liability	$ (557)	(298)
Receive Rate	5.44%
Pay Rate	5.85%
QCR Holdings Statutory Trust III
Notional Amount	$ 8,000
Fair Value - Liability	$ (445)	(239)
Receive Rate	5.44%
Pay Rate	5.85%
QCR Holdings Statutory Trust V
Notional Amount	$ 10,000
Fair Value - Liability	$ (540)	(288)
Receive Rate	4.34%
Pay Rate	4.54%
Community National Statutory Trust II
Notional Amount	$ 3,000
Fair Value - Liability	$ (166)	(89)
Receive Rate	4.80%
Pay Rate	5.17%
Community National Statutory Trust III
Notional Amount	$ 3,500
Fair Value - Liability	$ (194)	(104)
Receive Rate	4.36%
Pay Rate	4.75%
Guaranty Bankshares Statutory Trust I
Notional Amount	$ 4,500
Fair Value - Liability	$ (249)	$ (133)
Receive Rate	4.36%
Pay Rate	4.75%