Note 20 - Parent Company Only Financial Statements (Details) - Condensed Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and due from banks	$ 38,235,019us-gaap_CashAndDueFromBanks	$ 41,950,790us-gaap_CashAndDueFromBanks
Interest-bearing deposits at financial institutions	35,334,682us-gaap_InterestBearingDepositsInBanks	33,044,917us-gaap_InterestBearingDepositsInBanks
Securities available for sale, at fair value	451,659,630us-gaap_AvailableForSaleSecurities	551,758,458us-gaap_AvailableForSaleSecurities
Premises and equipment, net	36,021,128us-gaap_PropertyPlantAndEquipmentNet	36,755,364us-gaap_PropertyPlantAndEquipmentNet
Other assets	23,174,994us-gaap_OtherAssets	23,873,150us-gaap_OtherAssets
Total assets	2,524,958,100us-gaap_Assets	2,394,952,924us-gaap_Assets	2,093,730,492us-gaap_Assets
Liabilities:
Other borrowings	150,282,492us-gaap_OtherBorrowings	142,448,362us-gaap_OtherBorrowings
Other liabilities	38,653,681us-gaap_OtherLiabilities	37,003,742us-gaap_OtherLiabilities
Total liabilities	2,380,879,591us-gaap_Liabilities	2,247,376,144us-gaap_Liabilities
Stockholders' Equity:
Preferred stock		29,867us-gaap_PreferredStockValue
Common stock	8,074,443us-gaap_CommonStockValue	8,005,708us-gaap_CommonStockValue
Additional paid-in capital	61,668,968us-gaap_AdditionalPaidInCapital	90,154,528us-gaap_AdditionalPaidInCapital
Retained earnings	77,876,824	64,637,173
Treasury stock	(1,606,510)us-gaap_TreasuryStockValue	(1,606,510)us-gaap_TreasuryStockValue
Total liabilities and stockholders' equity	2,524,958,100	2,394,952,924
Bank Subsidiaries [Member] \| Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Investment in subsidiaries	198,881,739	187,410,269
Nonbank Subsidiaries [Member] \| Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Investment in subsidiaries	1,388,361	1,396,632
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and due from banks	4,499,139	7,212,584
Interest-bearing deposits at financial institutions	190,127	187,401
Securities available for sale, at fair value	1,724,353	1,644,663
Premises and equipment, net	3,160,035	3,243,575
Other assets	6,765,109	8,709,546
Total assets	216,608,863	209,804,670
Liabilities:
Other borrowings	21,745,116	14,104,323
Junior subordinated debentures	40,423,735	40,289,830
Other liabilities	10,361,503	7,833,737
Total liabilities	72,530,354	62,227,890
Stockholders' Equity:
Preferred stock		29,867
Common stock	8,074,443	8,005,708
Additional paid-in capital	61,668,968	90,154,528
Retained earnings	77,876,824	64,637,173
Accumulated other comprehensive loss	(1,935,216)	(13,643,986)
Treasury stock	(1,606,510)	(1,606,510)
Total stockholders' equity	144,078,509	147,576,780
Total liabilities and stockholders' equity	$ 216,608,863	$ 209,804,670

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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