Note 9 - Sales of Certain Branches of CNB and Merger of CNB into CRBT (Details) - Assets and Liabilities Sold (Subsequent Event [Member], USD $)	0 Months Ended		0 Months Ended
Oct. 04, 2013 Mason City Branch [Member]	Oct. 11, 2013 Austin Branch [Member]	Oct. 11, 2013
Business Acquisition [Line Items]
Cash	$ 29,905,991	$ 519,627
Loans receivable	22,709,735	31,749,135
Premises and equipment	776,782	1,597,040
Core deposit intangible, net, related to deposits sold	910,415	480,347
Other assets	68,456	70,443
Total assets sold	54,371,379	34,416,592
LIABILITIES
Deposits	55,191,930	35,830,168
Other liabilities	53,422	46,668
Total liabilties sold	55,245,352	35,876,836
Gain on sale, pre-tax	$ 873,973		$ 1,460,244

Core deposit intangible, net, related to deposits sold

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- Definition

Disposal group including discontinued operation deposits

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The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date.

+ References

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For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

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For the disposal group, including a component of the entity (discontinued operation), cash includes currency on hand as well as demand deposits with banks or financial institutions. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Cash Equivalents

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For the disposal group, including a component of the entity (discontinued operation), carrying amount as of the balance sheet date of assets not otherwise specified.

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For the disposal group, including a component of the entity (discontinued operation), obligations not otherwise itemized.

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For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Amount of gain (loss) on sale or disposal of other assets.

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The obligations arising from the sale, disposal, or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

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