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Note 12 - Junior Subordinated Debentures (Details Textual) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 27, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 01, 2017 | Feb. 29, 2004
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  | $ 3,857,275 |  |  |  |
Debt Instrument, Face Amount |  | 40,210,000 | 35,570,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ (4,577,668) | (7,185,601) |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.82% | 3.26% |  |  |
Junior Subordinated Debt [Member] |  |  |  |  |  |
Debt Instrument, Term |  | 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 II [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | 2,100,000 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 300,000 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 3.18% |  |
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) [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.80% | 2.85% |  |
Guaranty Bank and Trust Company [Member] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  | $ 3,857,275 |
Debt Instrument, Face Amount | $ 7,000,000 |  |  |  |  |
Debt Instrument, Term | 4 years |  |  |  |  |

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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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