Note 16 - Regulatory Capital Requirements and Restrictions on Dividends (Details) - Capital Requirements (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital	$ 204,376	$ 217,011
Total risk-based capital ratio	10.91%	12.87%
Total risk-based capital required for capital adequacy purposes	149,876	134,935
Total risk-based capital required for capital adequacy purposes ratio	8.00%	8.00%
Tier 1 risk-based capital	178,364	193,044
Tier 1 risk-based capital ratio	9.52%	11.45%
Tier 1 risk-based capital required for capital adequacy purposes	74,938	67,468
Tier 1 risk-based capital required for capital adequacy purposes ratio	4.00%	4.00%
Tier 1 leverage	178,364	193,044
Tier 1 leverage ratio	7.62%	7.96%
Tier 1 leverage required for capital adequacy purposes	93,658	97,029
Tier 1 leverage required for capital adequacy purposes ratio	4.00%	4.00%
Quad City Bank and Trust Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital	104,869	101,168
Total risk-based capital ratio	11.26%	12.25%
Total risk-based capital required for capital adequacy purposes	74,495	66,049
Total risk-based capital required for capital adequacy purposes ratio	8.00%	8.00%
Total risk-based capital required to be well capitalized under prompt corrective action provisions	93,119	82,562
Total risk-based capital required to be well capitalized under prompt corrective action provisions ratio	10.00%	10.00%
Tier 1 risk-based capital	93,785	91,820
Tier 1 risk-based capital ratio	10.07%	11.12%
Tier 1 risk-based capital required for capital adequacy purposes	37,248	33,025
Tier 1 risk-based capital required for capital adequacy purposes ratio	4.00%	4.00%
Tier 1 risk-based capital required to be well capitalized under prompt corrective action provisions	55,872	49,537
Tier 1 risk-based capital required to be well capitalized under prompt corrective action provisions ratio	6.00%	6.00%
Tier 1 leverage	93,785	91,820
Tier 1 leverage ratio	7.10%	7.13%
Tier 1 leverage required for capital adequacy purposes	52,817	51,527
Tier 1 leverage required for capital adequacy purposes ratio	4.00%	4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions	66,021	64,408
Tier 1 leverage required to be well capitalized under prompt corrective action provisions ratio	5.00%	5.00%
Cedar Rapids Bank and Trust [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital	76,662	74,912
Total risk-based capital ratio	11.54%	12.54%
Total risk-based capital required for capital adequacy purposes	53,126	47,808
Total risk-based capital required for capital adequacy purposes ratio	8.00%	8.00%
Total risk-based capital required to be well capitalized under prompt corrective action provisions	66,407	59,760
Total risk-based capital required to be well capitalized under prompt corrective action provisions ratio	10.00%	10.00%
Tier 1 risk-based capital	68,772	67,432
Tier 1 risk-based capital ratio	10.36%	11.28%
Tier 1 risk-based capital required for capital adequacy purposes	26,563	23,904
Tier 1 risk-based capital required for capital adequacy purposes ratio	4.00%	4.00%
Tier 1 risk-based capital required to be well capitalized under prompt corrective action provisions	39,844	35,856
Tier 1 risk-based capital required to be well capitalized under prompt corrective action provisions ratio	6.00%	6.00%
Tier 1 leverage	68,772	67,432
Tier 1 leverage ratio	8.21%	8.78%
Tier 1 leverage required for capital adequacy purposes	33,525	30,736
Tier 1 leverage required for capital adequacy purposes ratio	4.00%	4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions	41,906	38,420
Tier 1 leverage required to be well capitalized under prompt corrective action provisions ratio	5.00%	5.00%
Rockford Bank and Trust [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital	35,906	38,778
Total risk-based capital ratio	12.56%	14.59%
Total risk-based capital required for capital adequacy purposes	22,875	21,263
Total risk-based capital required for capital adequacy purposes ratio	8.00%	8.00%
Total risk-based capital required to be well capitalized under prompt corrective action provisions	28,594	26,579
Total risk-based capital required to be well capitalized under prompt corrective action provisions ratio	10.00%	10.00%
Tier 1 risk-based capital	32,325	35,449
Tier 1 risk-based capital ratio	11.30%	13.34%
Tier 1 risk-based capital required for capital adequacy purposes	11,438	10,631
Tier 1 risk-based capital required for capital adequacy purposes ratio	4.00%	4.00%
Tier 1 risk-based capital required to be well capitalized under prompt corrective action provisions	17,156	15,947
Tier 1 risk-based capital required to be well capitalized under prompt corrective action provisions ratio	6.00%	6.00%
Tier 1 leverage	32,325	35,449
Tier 1 leverage ratio	9.16%	10.54%
Tier 1 leverage required for capital adequacy purposes	14,112	13,459
Tier 1 leverage required for capital adequacy purposes ratio	4.00%	4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions	$ 17,640	$ 16,824
Tier 1 leverage required to be well capitalized under prompt corrective action provisions ratio	5.00%	5.00%