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Note 12 - Junior Subordinated Debentures - Trust Preferred Securities (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 12, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Aggregate principal amount |  | $ 40,210,000 | $ 40,210,000
Interest rate (as a percent) |  | 4.94% | 3.82%
London Interbank Offered Rate (LIBOR) |  |  |
Variable interest rate (as a percent) | 282.00% |  |
Trust Preferred Securities [Member] | Qcr Holdings Statutory Trust I I Member |  |  |
Date issued |  | February 2004 |
Aggregate principal amount |  | $ 10,310,000 | $ 10,310,000
Interest rate (as a percent) |  | 5.65% | 4.54%
Trust Preferred Securities [Member] | Qcr Holdings Statutory Trust I I Member | London Interbank Offered Rate (LIBOR) |  |  |
Variable interest rate (as a percent) |  | 2.85% |
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust III [Member] |  |  |
Date issued |  | February 2004 |
Aggregate principal amount |  | $ 8,248,000 | $ 8,248,000
Interest rate (as a percent) |  | 5.65% | 4.54%
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust III [Member] | London Interbank Offered Rate (LIBOR) |  |  |
Variable interest rate (as a percent) |  | 2.85% |
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust V [Member] |  |  |
Date issued |  | February 2006 |
Aggregate principal amount |  | $ 10,310,000 | $ 10,310,000
Interest rate (as a percent) |  | 3.99% | 2.91%
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust V [Member] | London Interbank Offered Rate (LIBOR) |  |  |
Variable interest rate (as a percent) |  | 1.55% |
Trust Preferred Securities [Member] | Community National Statutory Trust II [Member] |  |  |
Date issued |  | September 2004 |
Aggregate principal amount |  | $ 3,093,000 | $ 3,093,000
Interest rate (as a percent) |  | 4.96% | 3.80%
Trust Preferred Securities [Member] | Community National Statutory Trust II [Member] | London Interbank Offered Rate (LIBOR) |  |  |
Variable interest rate (as a percent) |  | 2.17% |
Trust Preferred Securities [Member] | Community National Statutory Trust III [Member] |  |  |
Date issued |  | March 2007 |
Aggregate principal amount |  | $ 3,609,000 | $ 3,609,000
Interest rate (as a percent) |  | 4.54% | 3.32%
Trust Preferred Securities [Member] | Community National Statutory Trust III [Member] | London Interbank Offered Rate (LIBOR) |  |  |
Variable interest rate (as a percent) |  | 1.75% |
Trust Preferred Securities [Member] | Guaranty Bankshares Statutory Trust I [Member] |  |  |
Date issued |  | May 2005 |
Aggregate principal amount |  | $ 4,640,000 | $ 4,640,000
Interest rate (as a percent) |  | 4.54% | 3.34%
Trust Preferred Securities [Member] | Guaranty Bankshares Statutory Trust I [Member] | London Interbank Offered Rate (LIBOR) |  |  |
Variable interest rate (as a percent) |  | 1.75% |

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