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Note 11 - Junior Subordinated Debentures (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 29, 2004
Note 11 - Junior Subordinated Debentures (Details) [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 40,725,000 |  | $ 40,725,000 |  |
Extinguishment of Debt, Amount |  | $ 103,500,000 |  |  |
Gains (Losses) on Extinguishment of Debt | $ 209,416 | $ (6,900,000) |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 3.10% |  |
Debt Instrument, Interest Rate, Effective Percentage | 2.60% |  | 2.60% | 2.50% |
Note Payable to QCR Holdings Capital Trust II [Member] |  |  |  |  |
Note 11 - Junior Subordinated Debentures (Details) [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 12,372,000
Junior Subordinated Debt [Member] |  |  |  |  |
Note 11 - Junior Subordinated Debentures (Details) [Line Items] |  |  |  |  |
Debt Instrument, Term |  |  | 30 years |  |
Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Note 11 - Junior Subordinated Debentures (Details) [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.85% |  |
Junior Subordinated Debt [Member] | Note Payable to QCR Holdings Capital Trust II [Member] |  |  |  |  |
Note 11 - Junior Subordinated Debentures (Details) [Line Items] |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 2,100,000 |  |
Gains (Losses) on Extinguishment of Debt |  |  | $ 300,000 |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.18% |  | 3.18% |  |

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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=34725769&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=6451184&loc=d3e28551-108399 + Details
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