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Note 8 - Capital Requirements (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015
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Parent Company [Member] |  |  |
Total risk-based capital, actual, amount |  | $ 322,562 | $ 280,273
Total risk-based capital, actual, ratio |  | 14.29% | 13.11%
Total risk-based capital for capital adequacy purposes, amount | [1] | $ 194,670 | $ 170,969
Total risk-based capital for capital adequacy purposes, ratio | [1] | 8.625% | 8.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 225,705 | $ 213,711
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 10.00% | 10.00%
Tier 1 risk-based capital, actual, amount |  | $ 294,265 | $ 253,891
Tier 1 risk-based capital, actual, ratio |  | 13.04% | 11.88%
Tier 1 risk-based capital for capital adequacy purposes, amount | [1] | $ 149,529 | $ 128,227
Tier 1 risk-based capital for capital adequacy purposes, ratio | [1] | 6.625% | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 180,564 | $ 170,969
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 8.00% | 8.00%
Tier 1 leverage, actual, amount |  | $ 294,265 | $ 253,891
Tier 1 leverage, actual, ratio |  | 11.18% | 9.75%
Tier 1 leverage for capital adequacy purposes, amount | [1] | $ 105,263 | $ 104,163
Tier 1 leverage for capital adequacy purposes, ratio | [1] | 4.00% | 4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount |  | $ 131,578 | $ 130,203
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio |  | 5.00% | 5.00%
Common equity Tier 1, actual, amount |  | $ 264,422 | $ 220,800
Common equity Tier 1, actual ratio |  | 11.72% | 10.33%
Common equity Tier 1 capital adequacy purposes, amount | [1] | $ 115,674 | $ 96,170
Common equity Tier 1 capital adequacy purposes, ratio | [1] | 5.125% | 4.50%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount |  | $ 146,708 | $ 138,912
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio |  | 6.50% | 6.50%
Quad City Bank and Trust Company [Member] |  |  |
Total risk-based capital, actual, amount |  | $ 143,744 | $ 135,477
Total risk-based capital, actual, ratio |  | 12.76% | 12.50%
Total risk-based capital for capital adequacy purposes, amount | [1] | $ 97,131 | $ 86,726
Total risk-based capital for capital adequacy purposes, ratio | [1] | 8.625% | 8.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 112,616 | $ 108,407
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 10.00% | 10.00%
Tier 1 risk-based capital, actual, amount |  | $ 131,003 | $ 123,498
Tier 1 risk-based capital, actual, ratio |  | 11.63% | 11.39%
Tier 1 risk-based capital for capital adequacy purposes, amount | [1] | $ 74,608 | $ 65,044
Tier 1 risk-based capital for capital adequacy purposes, ratio | [1] | 6.625% | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 90,093 | $ 86,726
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 8.00% | 8.00%
Tier 1 leverage, actual, amount |  | $ 131,003 | $ 123,498
Tier 1 leverage, actual, ratio |  | 9.42% | 8.87%
Tier 1 leverage for capital adequacy purposes, amount | [1] | $ 55,618 | $ 55,718
Tier 1 leverage for capital adequacy purposes, ratio | [1] | 4.00% | 4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount |  | $ 69,523 | $ 69,648
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio |  | 5.00% | 5.00%
Common equity Tier 1, actual, amount |  | $ 131,003 | $ 123,498
Common equity Tier 1, actual ratio |  | 11.63% | 11.39%
Common equity Tier 1 capital adequacy purposes, amount | [1] | $ 57,716 | $ 48,783
Common equity Tier 1 capital adequacy purposes, ratio | [1] | 5.125% | 4.50%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount |  | $ 73,200 | $ 70,465
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio |  | 6.50% | 6.50%
Cedar Rapids Bank and Trust [Member] |  |  |
Total risk-based capital, actual, amount |  | $ 110,325 | $ 105,285
Total risk-based capital, actual, ratio |  | 13.82% | 14.39%
Total risk-based capital for capital adequacy purposes, amount | [1] | $ 68,850 | $ 58,537
Total risk-based capital for capital adequacy purposes, ratio | [1] | 8.625% | 8.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 79,826 | $ 73,172
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 10.00% | 10.00%
Tier 1 risk-based capital, actual, amount |  | $ 100,331 | $ 96,118
Tier 1 risk-based capital, actual, ratio |  | 12.57% | 13.14%
Tier 1 risk-based capital for capital adequacy purposes, amount | [1] | $ 52,885 | $ 43,903
Tier 1 risk-based capital for capital adequacy purposes, ratio | [1] | 6.625% | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 63,861 | $ 58,537
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 8.00% | 8.00%
Tier 1 leverage, actual, amount |  | $ 100,331 | $ 96,118
Tier 1 leverage, actual, ratio |  | 11.20% | 10.96%
Tier 1 leverage for capital adequacy purposes, amount | [1] | $ 35,830 | $ 35,079
Tier 1 leverage for capital adequacy purposes, ratio | [1] | 4.00% | 4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount |  | $ 44,788 | $ 43,848
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio |  | 5.00% | 5.00%
Common equity Tier 1, actual, amount |  | $ 100,331 | $ 96,118
Common equity Tier 1, actual ratio |  | 12.57% | 13.14%
Common equity Tier 1 capital adequacy purposes, amount | [1] | $ 40,911 | $ 32,927
Common equity Tier 1 capital adequacy purposes, ratio | [1] | 5.125% | 4.50%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount |  | $ 51,887 | $ 47,562
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio |  | 6.50% | 6.50%
Rockford Bank and Trust [Member] |  |  |
Total risk-based capital, actual, amount |  | $ 40,108 | $ 38,544
Total risk-based capital, actual, ratio |  | 11.87% | 11.96%
Total risk-based capital for capital adequacy purposes, amount | [1] | $ 29,154 | $ 25,772
Total risk-based capital for capital adequacy purposes, ratio | [1] | 8.625% | 8.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 33,801 | $ 32,216
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 10.00% | 10.00%
Tier 1 risk-based capital, actual, amount |  | $ 35,877 | $ 34,514
Tier 1 risk-based capital, actual, ratio |  | 10.61% | 10.71%
Tier 1 risk-based capital for capital adequacy purposes, amount | [1] | $ 22,393 | $ 19,329
Tier 1 risk-based capital for capital adequacy purposes, ratio | [1] | 6.625% | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 27,041 | $ 25,772
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 8.00% | 8.00%
Tier 1 leverage, actual, amount |  | $ 35,877 | $ 34,514
Tier 1 leverage, actual, ratio |  | 9.50% | 9.59%
Tier 1 leverage for capital adequacy purposes, amount | [1] | $ 15,099 | $ 14,401
Tier 1 leverage for capital adequacy purposes, ratio | [1] | 4.00% | 4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount |  | $ 18,874 | $ 18,001
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio |  | 5.00% | 5.00%
Common equity Tier 1, actual, amount |  | $ 35,877 | $ 34,514
Common equity Tier 1, actual ratio |  | 10.61% | 10.71%
Common equity Tier 1 capital adequacy purposes, amount | [1] | $ 17,323 | $ 14,497
Common equity Tier 1 capital adequacy purposes, ratio | [1] | 5.125% | 4.50%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount |  | $ 21,971 | $ 20,940
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio |  | 6.50% | 6.50%
[1] | The minimums under Basel III phase in higher by .625% (the capital conservation buffer) annually until 2019. The fully phased-in minimums are 10.5% (Total risk-based capital), 8.5% (Tier 1 risk-based capital), and 7.0% (Common equity Tier 1). At December 31, 2015, the New Basel III minimums mirrored the minimums required for capital adequacy purposes. The first phase-in of the Basel III capital conservation buffer occured in 2016.

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- Definition The minimum amount of Common equity Tier 1 required for capital adequacy purposes as defined in the regulations. + References No definition available. + Details
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- Definition The amount of Common equity Tier 1 required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The ratio Tier 1 Leverage Capital required to be categorized as well capitalized as defined in the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Total Capital divided by risk weighted assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition Tier 1 Risk Based Capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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