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Note 7 - Selected Financial Information on the Company's Business Segments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Operating Segments [Member] | Commercial Banking Segment [Member] | Quad City Bank and Trust Company [Member] |  |  |  |  |
Total revenue | $ 14,162,914 | $ 12,930,582 | $ 27,679,846 | $ 25,732,000 |
Net interest income | 11,207,759 | 9,741,899 | 22,169,206 | 19,016,937 |
Net income (loss) | 3,898,343 | 229,577 | 6,730,039 | 2,792,190 |
Assets | 1,390,025,232 | 1,299,556,911 | 1,390,025,232 | 1,299,556,911 |
Provision for loan/lease losses | 747,850 | 1,673,665 | 1,970,835 | 2,556,121 |
Goodwill | 3,222,688 | 3,222,688 | 3,222,688 | 3,222,688 |
Core deposit intangible |  |  |  |  |
Operating Segments [Member] | Commercial Banking Segment [Member] | Cedar Rapids Bank and Trust [Member] |  |  |  |  |
Total revenue | 10,438,092 | 8,777,259 | 21,277,313 | 18,302,906 |
Net interest income | 7,135,725 | 6,522,511 | 14,160,713 | 12,880,808 |
Net income (loss) | 3,144,986 | (316,567) | 6,079,717 | 1,751,739 |
Assets | 904,367,275 | 860,403,296 | 904,367,275 | 860,403,296 |
Provision for loan/lease losses | 150,000 | 500,000 | 700,000 | 1,100,000 |
Goodwill |  |  |  |  |
Core deposit intangible | 1,371,653 | 1,571,165 | 1,371,653 | 1,571,165 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Rockford Bank and Trust [Member] |  |  |  |  |
Total revenue | 3,918,629 | 3,627,740 | 7,712,876 | 7,169,330 |
Net interest income | 2,945,417 | 2,684,330 | 5,857,391 | 5,318,412 |
Net income (loss) | 772,169 | 529,567 | 1,389,954 | 1,048,224 |
Assets | 402,157,473 | 363,049,771 | 402,157,473 | 363,049,771 |
Provision for loan/lease losses | 300,000 | 175,000 | 600,000 | 403,000 |
Goodwill |  |  |  |  |
Core deposit intangible |  |  |  |  |
Operating Segments [Member] | Wealth Management Segment [Member] |  |  |  |  |
Total revenue | 2,204,821 | 2,269,609 | 4,439,113 | 4,613,047 |
Net interest income |  |  |  |  |
Net income (loss) | 386,202 | 438,530 | 833,972 | 897,860 |
Assets |  |  |  |  |
Provision for loan/lease losses |  |  |  |  |
Goodwill |  |  |  |  |
Core deposit intangible |  |  |  |  |
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |
Total revenue | 8,244,495 | 718,325 | 15,104,270 | 6,334,768 |
Net interest income | (280,088) | (457,904) | (580,975) | (943,104) |
Net income (loss) | 6,676,467 | (523,818) | 13,049,955 | 3,654,071 |
Assets | 328,099,700 | 268,874,722 | 328,099,700 | 268,874,722 |
Provision for loan/lease losses |  |  |  |  |
Goodwill |  |  |  |  |
Core deposit intangible |  |  |  |  |
Intersegment Eliminations [Member] |  |  |  |  |
Total revenue | (8,293,266) | (811,669) | (15,213,201) | (6,516,697) |
Net interest income |  |  |  |  |
Net income (loss) | (8,201,700) | (881,107) | (15,033,681) | (6,490,013) |
Assets | (341,215,392) | (248,915,854) | (341,215,392) | (248,915,854) |
Provision for loan/lease losses |  |  |  |  |
Goodwill |  |  |  |  |
Core deposit intangible |  |  |  |  |
Total revenue | 30,675,685 | 27,511,846 | 61,000,217 | 55,635,354 |
Net interest income | 21,008,813 | 18,490,836 | 41,606,335 | 36,273,053 |
Net income (loss) | 6,676,467 | (523,818) | 13,049,956 | 3,654,071 |
Assets | 2,683,434,288 | 2,542,968,846 | 2,683,434,288 | 2,542,968,846 | $ 2,593,198,275
Provision for loan/lease losses | 1,197,850 | 2,348,665 | 3,270,835 | 4,059,121 |
Goodwill | 3,222,688 | 3,222,688 | 3,222,688 | 3,222,688 | 3,222,688
Core deposit intangible | $ 1,371,653 | $ 1,571,165 | $ 1,371,653 | $ 1,571,165 | $ 1,471,409

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