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Note 7 - Business Segment Information - Selected Financial Information on the Company's Business Segments (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Operating Segments [Member] | Commercial Banking Segment [Member] | Quad City Bank and Trust Company [Member] |  |  |  |  |
Total revenue | $ 18,026,215 | $ 14,143,548 | $ 45,706,061 | $ 39,893,713 |
Net interest income | 11,225,414 | 10,728,143 | 33,394,620 | 29,745,080 |
Net income (loss) | 3,596,469 | 3,786,289 | 10,326,508 | 6,578,479 |
Total assets | 1,407,733,009 | 1,328,053,105 | 1,407,733,009 | 1,328,053,105 |
Provision for loan/lease losses | 1,137,986 | 910,263 | 3,108,821 | 3,466,384 |
Goodwill | 3,222,688 | 3,222,688 | 3,222,688 | 3,222,688 |
Finite-Lived Intangible Assets, Net |  |  |  |  |
Operating Segments [Member] | Commercial Banking Segment [Member] | Cedar Rapids Bank and Trust [Member] |  |  |  |  |
Total revenue | 10,065,032 | 10,047,658 | 31,342,345 | 28,396,380 |
Net interest income | 7,594,557 | 6,956,027 | 21,755,270 | 19,836,835 |
Net income (loss) | 3,286,724 | 2,893,397 | 9,366,441 | 4,645,136 |
Total assets | 887,592,695 | 867,064,041 | 887,592,695 | 867,064,041 |
Provision for loan/lease losses |  | 550,000 | 700,000 | 1,650,000 |
Goodwill |  |  |  |  |
Finite-Lived Intangible Assets, Net | 1,321,775 | 1,521,287 | 1,321,775 | 1,521,287 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Community State Bank [Member] |  |  |  |  |
Total revenue | 2,675,741 |  | 2,675,741 |  |
Net interest income | 2,191,862 |  | 2,191,862 |  |
Net income (loss) | 188,608 |  | 188,608 |  |
Total assets | 580,210,270 |  | 580,210,270 |  |
Provision for loan/lease losses | 270,000 |  | 270,000 |  |
Goodwill | 10,408,938 |  | 10,408,938 |  |
Finite-Lived Intangible Assets, Net | 6,291,818 |  | 6,291,818 |  |
Operating Segments [Member] | Commercial Banking Segment [Member] | Rockford Bank and Trust [Member] |  |  |  |  |
Total revenue | 4,232,205 | 3,922,304 | 11,945,081 | 11,095,899 |
Net interest income | 3,056,989 | 2,771,214 | 8,914,380 | 8,089,626 |
Net income (loss) | 944,781 | 847,709 | 2,334,735 | 1,895,933 |
Total assets | 393,191,774 | 360,348,002 | 393,191,774 | 360,348,002 |
Provision for loan/lease losses | 200,000 | 175,000 | 800,000 | 578,000 |
Goodwill |  |  |  |  |
Finite-Lived Intangible Assets, Net |  |  |  |  |
Operating Segments [Member] | Wealth Management Segment [Member] |  |  |  |  |
Total revenue | 2,284,577 | 2,314,406 | 6,723,690 | 6,927,453 |
Net interest income |  |  |  |  |
Net income (loss) | 398,859 | 373,801 | 1,232,831 | 1,271,661 |
Total assets |  |  |  |  |
Provision for loan/lease losses |  |  |  |  |
Goodwill |  |  |  |  |
Finite-Lived Intangible Assets, Net |  |  |  |  |
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |
Total revenue | 8,463,636 | 7,937,087 | 23,567,906 | 14,487,857 |
Net interest income | (438,045) | (317,858) | (1,019,020) | (1,260,962) |
Net income (loss) | 6,107,492 | 6,488,988 | 19,157,447 | 10,143,059 |
Total assets | 368,990,749 | 277,001,408 | 368,990,749 | 277,001,408 |
Provision for loan/lease losses |  |  |  |  |
Goodwill |  |  |  |  |
Finite-Lived Intangible Assets, Net |  |  |  |  |
Intersegment Eliminations [Member] |  |  |  |  |
Total revenue | (8,507,270) | (8,821,205) | (23,720,471) | (15,556,437) |
Net interest income |  |  |  |  |
Net income (loss) | (8,415,432) | (7,901,197) | (23,449,113) | (14,391,210) |
Total assets | (356,732,388) | (256,611,839) | (356,732,388) | (256,611,839) |
Provision for loan/lease losses |  |  |  |  |
Goodwill |  |  |  |  |
Finite-Lived Intangible Assets, Net |  |  |  |  |
Total revenue | 37,240,136 | 29,543,798 | 98,240,353 | 85,244,865 |
Net interest income | 23,630,777 | 20,137,526 | 65,237,112 | 56,410,579 |
Net income (loss) | 6,107,501 | 6,488,987 | 19,157,457 | 10,143,058 |
Total assets | 3,280,986,109 | 2,575,854,717 | 3,280,986,109 | 2,575,854,717 | $ 2,593,198,275
Provision for loan/lease losses | 1,607,986 | 1,635,263 | 4,878,821 | 5,694,384 |
Goodwill | 13,631,626 | 3,222,688 | 13,631,626 | 3,222,688 | 3,222,688
Finite-Lived Intangible Assets, Net | $ 7,613,593 | $ 1,521,287 | $ 7,613,593 | $ 1,521,287 | $ 1,471,409

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