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Note 9 - Acquisition of Community State Bank and Common Stock Offering (Details Textual) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2016 | Dec. 31, 2015 USD ($)
Community State Bank [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |
Return on Average Assets |  |  |  |  |  |  |  | 1.00% |
Community State Bank [Member] |  |  |  |  |  |  |  |  |
Number of Branches | 10 |  |  |  |  |  |  |  |
Community State Bank [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |  |
Nonaccretable Discount, Accelerated |  |  | $ 89,000 |  |  |  |  |  |
Community State Bank [Member] | Ten Branch Locations [Member] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | $ 19,735,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Write-up | $ 8,334,437 |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 39 years |  |  |  |  |  |  |  |
Community State Bank [Member] | Core Deposits [Member] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 6,352,653 |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net |  | $ 6,291,819 | 6,291,819 |  |  | $ 6,291,819 |  |  |
Community State Bank [Member] |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 80,000,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 581,155,765 |  |  |  |  |  |  |  |
Dividends, Cash |  |  |  |  |  | 15,200,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 20,684,880 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 6,352,653 |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  | 473,000 |  |  |  | 2,400,000 |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 2,700,000 |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | 189,000 |  |  |  |  |  |  |
Community National Bancorporation and Community National Bank [Member] | Core Deposits [Member] |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net |  | 1,321,774 | 1,321,774 |  |  | 1,321,774 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Proceeds from Lines of Credit | $ 5,000,000 |  |  |  |  | 5,000,000 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 10,000,000 | 10,000,000 | $ 10,000,000 |  | 10,000,000 |  |  | $ 40,000,000
Core Deposits [Member] |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net |  | 6,291,819 | 6,291,819 |  |  | 6,291,819 |  |  | 6,352,653
Stock Issued During Period, Shares, New Issues | shares |  |  |  | 1,215,000 |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  |  |  | $ 24.75 |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 29,800,000 |  | 1,554,506 | $ 1,016,324 |  |
Notes Payable |  | 30,000,000 | 30,000,000 |  |  | 30,000,000 |  |  |
Finite-Lived Intangible Assets, Net |  | $ 7,613,593 | 7,613,593 |  | $ 1,521,287 | 7,613,593 | 1,521,287 |  | $ 1,471,409
Business Combination, Acquisition Related Costs |  |  | $ 2,046,036 |  |  | $ 2,401,005 |  |  |

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- Definition The amount of property, plant, and equipment write-up of value recognized as of the acquisition date. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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