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Note 6 - Business Segment Information - Selected Financial Information on the Company's Business Segments (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Total revenue | $ 40,542,168 |  |  | $ 37,240,136 |  |  | $ 118,406,807 | $ 98,240,353 |
Net interest income | 28,556,348 |  |  | 23,630,777 |  |  | 84,271,928 | 65,237,112 |
Provision for loan/lease losses | 2,086,436 |  |  | 1,607,986 |  |  | 6,214,538 | 4,878,821 |
Net income (loss) | 7,853,935 | $ 8,766,017 | $ 9,184,965 | 6,107,501 | $ 6,676,467 | $ 6,373,489 | 25,804,917 | 19,157,457 |
Goodwill | 13,110,913 |  |  | 13,631,626 |  |  | 13,110,913 | 13,631,626 | $ 13,110,913
Core deposit intangible | 6,688,613 |  |  | 7,613,593 |  |  | 6,688,613 | 7,613,593 | 7,381,213
Total assets | 3,550,463,094 |  |  | 3,280,986,109 |  |  | 3,550,463,094 | 3,280,986,109 | $ 3,301,943,748
Operating Segments [Member] | Commercial Banking Segment [Member] | Quad City Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |
Total revenue | 11,771,842 |  |  | 18,026,215 |  |  | 39,517,823 | 45,706,061 |
Net interest income | 11,664,970 |  |  | 11,225,414 |  |  | 34,381,270 | 33,394,620 |
Provision for loan/lease losses | 1,140,436 |  |  | 1,137,986 |  |  | 2,624,538 | 3,108,821 |
Net income (loss) | 3,929,158 |  |  | 3,596,469 |  |  | 11,657,941 | 10,326,508 |
Goodwill | 3,222,688 |  |  | 3,222,688 |  |  | 3,222,688 | 3,222,688 |
Core deposit intangible |  |  |  |  |  |  |  |  |
Total assets | 1,456,251,244 |  |  | 1,407,733,009 |  |  | 1,456,251,244 | 1,407,733,009 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Cedar Rapids Bank and Trust [Member] |  |  |  |  |  |  |  |  |
Total revenue | 10,892,025 |  |  | 10,065,032 |  |  | 31,428,339 | 31,342,345 |
Net interest income | 7,903,483 |  |  | 7,594,557 |  |  | 22,107,955 | 21,755,270 |
Provision for loan/lease losses | 200,000 |  |  |  |  |  | 750,000 | 700,000 |
Net income (loss) | 3,130,319 |  |  | 3,286,724 |  |  | 8,893,461 | 9,366,441 |
Goodwill |  |  |  |  |  |  |  |  |
Core deposit intangible | 1,122,263 |  |  | 1,321,775 |  |  | 1,122,263 | 1,321,775 |
Total assets | 1,007,062,151 |  |  | 887,592,695 |  |  | 1,007,062,151 | 887,592,695 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Community State Bank [Member] |  |  |  |  |  |  |  |  |
Total revenue | 7,678,006 |  |  | 2,675,741 |  |  | 23,981,019 | 2,675,741 |
Net interest income | 6,379,111 |  |  | 2,191,862 |  |  | 20,326,439 | 2,191,862 |
Provision for loan/lease losses | 574,000 |  |  | 270,000 |  |  | 2,209,000 | 270,000 |
Net income (loss) | 1,669,209 |  |  | 188,608 |  |  | 5,484,383 | 188,608 |
Goodwill | 9,888,225 |  |  | 10,408,938 |  |  | 9,888,225 | 10,408,938 |
Core deposit intangible | 5,566,350 |  |  | 6,291,818 |  |  | 5,566,350 | 6,291,818 |
Total assets | 631,963,143 |  |  | 580,210,270 |  |  | 631,963,143 | 580,210,270 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Rockford Bank and Trust [Member] |  |  |  |  |  |  |  |  |
Total revenue | 4,534,768 |  |  | 4,232,205 |  |  | 12,723,998 | 11,945,081 |
Net interest income | 3,245,346 |  |  | 3,056,989 |  |  | 9,308,932 | 8,914,380 |
Provision for loan/lease losses | 172,000 |  |  | 200,000 |  |  | 631,000 | 800,000 |
Net income (loss) | 726,926 |  |  | 944,781 |  |  | 2,406,337 | 2,334,735 |
Goodwill |  |  |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |  |
Total assets | 445,098,530 |  |  | 393,191,774 |  |  | 445,098,530 | 393,191,774 |
Operating Segments [Member] | Wealth Management Segment [Member] |  |  |  |  |  |  |  |  |
Total revenue | 2,689,853 |  |  | 2,284,577 |  |  | 7,952,495 | 6,723,690 |
Net interest income |  |  |  |  |  |  |  |  |
Provision for loan/lease losses |  |  |  |  |  |  |  |  |
Net income (loss) | 539,091 |  |  | 398,859 |  |  | 1,554,618 | 1,232,831 |
Goodwill |  |  |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |
Total revenue | 10,028,660 |  |  | 8,463,636 |  |  | 30,086,617 | 23,567,906 |
Net interest income | (636,562) |  |  | (438,045) |  |  | (1,852,668) | (1,019,020) |
Provision for loan/lease losses |  |  |  |  |  |  |  |  |
Net income (loss) | 7,853,935 |  |  | 6,107,492 |  |  | 25,804,917 | 19,157,447 |
Goodwill |  |  |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |  |
Total assets | 395,697,820 |  |  | 368,990,749 |  |  | 395,697,820 | 368,990,749 |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Total revenue | (7,052,986) |  |  | (8,507,270) |  |  | (27,283,484) | (23,720,471) |
Net interest income |  |  |  |  |  |  |  |  |
Provision for loan/lease losses |  |  |  |  |  |  |  |  |
Net income (loss) | (9,994,703) |  |  | (8,415,432) |  |  | (29,996,740) | (23,449,113) |
Goodwill |  |  |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |  |
Total assets | $ (385,609,794) |  |  | $ (356,732,388) |  |  | $ (385,609,794) | $ (356,732,388) |

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