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Note 12 - Junior Subordinated Debentures - Junior Subordinated Debentures (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Junior subordinated debentures |  | $ 37,486,487 | $ 33,480,202
Junior subordinated debentures | [1] | (2,723,513) | (2,089,798)
Note Payable to QCR Holdings Capital Trust II [Member] |  |  |
Junior subordinated debentures |  | 10,310,000 | 10,310,000
Note Payable to Trust III [Member] |  |  |
Junior subordinated debentures |  | 8,248,000 | 8,248,000
Note Payable to Trust V [Member] |  |  |
Junior subordinated debentures |  | 10,310,000 | 10,310,000
Community National Trust II [Member] |  |  |
Junior subordinated debentures |  | 3,093,000 | 3,093,000
Community National Trust III [Member] |  |  |
Junior subordinated debentures |  | 3,609,000 | 3,609,000
Note Payable to Guaranty Bankshares Statutory Trust I [Member] |  |  |
Junior subordinated debentures | [2] | $ 4,640,000 |
[1] | Discount on junior subordinated debt acquired in 2013 as part of the purchase of Community National and junior subordinated debt acquired in 2017 as part of the purchase of Guaranty Bank.
[2] | As part of the acquisition of Guaranty Bank, the Company assumed one junior subordinated debenture with a fair value of $3,857,275.

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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: 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 + Details
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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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