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Note 12 - Junior Subordinated Debentures (Details) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 12, 2019 | Sep. 27, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) loan | Feb. 29, 2004 USD ($)
Other borrowings |  |  |  |  | $ 3,857,275 |  |
Debt Instrument, Face Amount |  |  | $ 40,210,000 |  | $ 40,210,000 |  |
Gain (loss) on extinguishment of debt |  |  |  | $ (4,577,668) |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 4.94% |  | 3.82% |  |
London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 282.00% |  |  |  |  |  |
Junior Subordinated Debt [Member] |  |  |  |  |  |  |
Repayment period (in years) |  |  | 30 years |  |  |  |
Note Payable to QCR Holdings Capital Trust II [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 12,372,000
Note Payable to QCR Holdings Capital Trust IV [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | 5,100,000 |  |  |
Gain (loss) on extinguishment of debt |  |  |  | $ 1,200,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 2.42% |  |  |
Note Payable to QCR Holdings Capital Trust IV [Member] | Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.80% |  |  |
Guaranty Bank and Trust Company [Member] |  |  |  |  |  |  |
Number of assumed junior subordinated debentures | loan |  |  |  |  |  | 1 |
Other borrowings |  |  |  |  |  | $ 3,857,275 |
Debt Instrument, Face Amount |  | $ 7,000,000 |  |  |  |  |
Repayment period (in years) |  | 4 years |  |  |  |  |

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