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Initial direct leasing costs as a percentage of cost.

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Lending threshold requiring additional loan review.

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Maximum amount of financing receivables that may be that may be issued under the Company's lending policy as a percentage of total risk-based capital.

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Residual value percent of cost.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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A bank's noninterest bearing demand deposits in other banks (such as correspondents).

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Note 1 - Nature of Business and Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2012	Sep. 30, 2012	Aug. 31, 2012	Aug. 27, 2012	Aug. 31, 2005	Oct. 31, 2012
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Equity Method Investment, Ownership Percentage			2.25%
Cash and Cash Equivalents, Policy [Policy Text Block]	Presentation of cash flows: For purposes of reporting cash flows, cash and due from banks include cash on hand and noninterest bearing amounts due from banks. Cash flows from federal funds sold, interest bearing deposits at financial institutions, loans/leases, deposits, and short-term and other borrowings are treated as net increases or decreases. Cash and due from banks: The subsidiary banks are required by federal banking regulations to maintain certain cash and due from bank reserves. The reserve requirement was approximately $23,251,000 and $22,435,000 as of December 31, 2014 and 2013, respectively.
Due from Banks (in Dollars)	$ 23,251,000us-gaap_DueFromBanks	$ 22,435,000us-gaap_DueFromBanks
Initial Direct Leasing Costs As a Percentage of Cost	5.50%
Lending Threshold Requiring Additional Loan Review (in Dollars)	1,000,000
Allocated Share-based Compensation Expense (in Dollars)	891,619	792,279	849,760
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)	737,464
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares)	420,429	419,735	391,378
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in Dollars)	2,771,424
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value (in Dollars)	1,754,995
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)	$ 173,105	$ 268,920	$ 56,371
New Accounting Pronouncements, Policy [Policy Text Block]	New accounting pronouncements: In January 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The objective of ASU 2014-04 is to reduce diversity by clarifying when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU 2014-04 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014 and is not expected to have a significant impact on the Company’s consolidated financial statements. In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers. ASU 2014-09 implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract and (v) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 is effective on January 1, 2017 and is not expected to have a significant impact on the Company’s consolidated financial statements. In June 2014, FASB issued ASU 2014-11, Transfers and Servicing. ASU 2014-11 requires that repurchase-to-maturity transactions be accounted for as secured borrowings, consistent with the accounting for other repurchase agreements. In addition, ASU 2014-11 requires separate accounting for repurchase financings, which entail the transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. The standard requires entities to disclose certain information about transfers accounted for as sales in transactions that are economically similar to repurchase agreements. In addition, ASU 2014-11 requires disclosures related to collateral and remaining tenor and of the potential risks associated with repurchase agreements, securities lending transactions and repurchase-to-maturity transactions. ASU 2014-11 is effective on January 1, 2015 and is not expected to have a significant impact on the Company’s consolidated financial statements. In August 2014, FASB issued ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans Upon Foreclosure. ASU 2014-14 requires creditors to reclassify loans that are within the scope of the ASU to “other receivables” upon foreclosure, rather than reclassifying them as other real estate owned. The most common types of government guaranteed loans include those guaranteed by the Federal Housing Authority (FHA), U.S. Department of Housing and Urban Development (HUD), U.S. Department of Veterans Affairs (VA) and the U.S. Small Business Administration (SBA). The separate other receivable recorded upon foreclosure is to be measured based on the amount of the loan balance (principal and interest) the creditor expects to recover from the guarantor. ASU 2014-14 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014 and is not expected to have a significant impact on the Company’s consolidated financial statements.
Adjustable Rate Residential Mortgage [Member] \| Minimum [Member] \| Subsidiaries [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Debt Instrument, Term	1 year
Adjustable Rate Residential Mortgage [Member] \| Maximum [Member] \| Subsidiaries [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Debt Instrument, Term	5 years
Fixed Rate Residential Mortgage [Member] \| Subsidiaries [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Debt Instrument, Term	15 years
Owner-Occupied Commercial Real Estate [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Commercial Real Estate Owner Occupied, Percentage	37.00%	39.00%
In-the-money Options [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares)	583,466
Non-Owner Occupied Commercial Real Estate [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Loan and Leases Recievable, Lending Limits	300.00%
Commercial Construction, Land Development, and Other Land [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Loan and Leases Recievable, Lending Limits	100.00%
m2 Lease Funds LLC [Member] \| Quad City Bank and Trust Company [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent				80.00%
Velie Plantation Holding Company LLC [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent					91.00%
Core Deposits [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
m2 Lease Funds LLC [Member] \| Quad City Bank and Trust Company [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired						20.00%
m2 Lease Funds LLC [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired							20.00%	80.00%
Velie Plantation Holding Company LLC [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired									9.00%
Minimum [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Residual Value Percent of Cost	3.00%
Debt Instrument, Term	3 years
Maximum [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Residual Value Percent of Cost	15.00%
Debt Instrument, Term	5 years
Line of Credit Facility, Expiration Period	365 days
General Maximum [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Debt Instrument, Term	7 years
Ruhl Mortgage [Member] \| Quad City Bank and Trust Company [Member]
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items]
Equity Method Investment, Ownership Percentage	20.00%