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Note 4 - Borrowings (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 31, 2016 | Jun. 30, 2016 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% |  |  |  |  | 2.50%
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  | $ 0
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 10,000,000 | $ 10,000,000 |  | $ 10,000,000 |  | $ 40,000,000
Debt Instrument, Interest Rate, Effective Percentage |  |  | 3.34% |  | 3.34% |  | 3.10%
Proceeds from Lines of Credit | $ 5,000,000 |  |  |  | $ 5,000,000 |  |
Whole sale Repurchase Agreements [Member] |  |  |  |  |  |  |
Repayments of Other Debt |  |  | $ 55,000,000 | $ 10,000,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | 10,000,000 |  | 10,000,000 |  | $ 10,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  |  |  |  |  | 10,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  | 10,000,000 |  | 10,000,000 |  | 45,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five |  |  | 25,000,000 |  | 25,000,000 |  | 45,000,000
Securities Sold under Agreements to Repurchase, Fair Value of Collateral |  |  | 27,800,000 |  | 27,800,000 |  |
Long-term Debt |  |  | $ 45,000,000 |  | $ 45,000,000 |  | $ 110,000,000
Wholesale Repurchase Agreement and FHLB Advances [Member] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.24% | 3.92% | 3.24% |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 4,100,000 | $ (1,300,000) |  |  |
Extinguished Debt Weighted Average Term |  |  | 2 years 346 days | 2 years 62 days |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  |  | $ 10,000,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | $ 5,000,000 | $ 10,000,000 | $ 5,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  | 35,000,000 |  | 35,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five |  |  | 20,000,000 |  | 20,000,000 |  |
Revolving Line of Credit Note [Member] |  |  |  |  |  |  |
Long-term Debt |  |  | 35,000,000 |  | 35,000,000 |  |
London Interbank Offered Rate (LIBOR) [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.80% |  |  |
Term Note [Member] |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | 6,000,000 |  | 6,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | 6,000,000 |  | 6,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  | 6,000,000 |  | 6,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five |  |  | $ 6,000,000 |  | $ 6,000,000 |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.00% |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 3.84% |  | 3.84% |  |
Notes Payable |  | $ 30,000,000 |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |
Proceeds from Notes Payable | $ 30,000,000 |  |  |  |  |  |
Long-term Debt |  |  | $ 30,000,000 |  | $ 30,000,000 |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | 1,500,000 |  |
Junior Subordinated Debt [Member] | Note Payable to QCR Holdings Capital Trust IV [Member] |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 1,200,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 2.42% |  |  |
Extinguishment of Debt, Amount |  |  |  | $ 5,100,000 |  |  |
Repayments of Other Debt |  |  |  |  | 50,320,407 | $ 29,177,000 |
Repayments of Federal Home Loan Bank Borrowings |  |  | $ 5,000,000 | $ 10,000,000 | $ 10,524,197 | $ 81,192,185 |
Short-term Debt, Weighted Average Interest Rate |  |  | 0.50% | 0.50% | 0.50% |  |
Notes Payable |  |  | $ 30,000,000 |  | $ 30,000,000 |  |

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