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Note 13 - Stockholders' Equity (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 $ / shares shares
Note 13 - Stockholders' Equity (Details) [Line Items] |  |
Treasury Stock, Shares, Acquired | shares | 735,599 | 914,671
Treasury Stock Acquired, Average Cost Per Share | $ / shares | $ 19.51 | $ 19.29
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 899,600 |
Shareholder Rights Plan [Member] |  |
Note 13 - Stockholders' Equity (Details) [Line Items] |  |
Number of Rights to Purchase Series A Junior Participating Preferred Stock Per Common Stock Owned | 1 |
Purchase Price of Series A Junior Participating Preferred Stock, Per Right To Purchase | $ 65 |
Percentage Ownership of Holding Company's Common Stock At Which Rights Become Exercisable | 15.00% |
Percentage of Common Stock Prior to Acquisition | 50.00% |
Percentage of Assets or Earning Power Sold |  | 50.00%
Shareholder Rights Plan [Member] | Common Stock [Member] |  |
Note 13 - Stockholders' Equity (Details) [Line Items] |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares | 1 |
Shareholder Rights Plan [Member] | Common Stock Equivalent [Member] |  |
Note 13 - Stockholders' Equity (Details) [Line Items] |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares | 1 |
Savings Bank [Member] |  |
Note 13 - Stockholders' Equity (Details) [Line Items] |  |
Liquidation Account, Conversion From Mutual to Stock Form | $ 800,000 |
Available to Distribute to the Holding Company as Cash Dividends [Member] |  |
Note 13 - Stockholders' Equity (Details) [Line Items] |  |
Retained Earnings, Unappropriated | $ 67,400,000 |

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- Definition Number of rights each share of common stock owned allows the holder to use to purchase Series A junior participating preferred stock. + References No definition available. + Details
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- Definition Represents the level of percent ownership by a person or group which must be met before the rights to purchase the Series A junior participating preferred stock will become exercisable. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition A segregation of retained earnings which is available for dividend distribution. Earnings not paid out as dividends but instead reinvested in the core business or used to pay off debt. Unappropriated profit is part of shareholder equity. Also called cumulative distributions or earned surplus or accumulated earnings or unappropriated profit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30(a)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(4)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph a(4) -Article 7 + Details
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