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Note 4 - Loans (Details) - Loans Modified in Troubled Debt Restructurings | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 3 | 4 | 8
Pre-Modification Recorded Investment | $ 1,620,213 | $ 2,571,343 | $ 2,423,933
Post-Modification Recorded Investment | $ 1,541,568 | $ 2,575,355 | $ 2,297,487
Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts |  |  | 2
Pre-Modification Recorded Investment |  |  | $ 228,633
Post-Modification Recorded Investment |  |  | $ 225,959
Real Estate Portfolio Segment [Member] | Commercial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 1 | 1 | 1
Pre-Modification Recorded Investment | $ 513,868 | $ 1,771,395 | $ 225,852
Post-Modification Recorded Investment | $ 505,978 | $ 1,775,407 | $ 225,852
Real Estate Portfolio Segment [Member] | Residential [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 2 | 1 | 4
Pre-Modification Recorded Investment | $ 1,106,345 | $ 49,194 | $ 1,885,700
Post-Modification Recorded Investment | $ 1,035,590 | $ 49,194 | $ 1,764,399
Real Estate Portfolio Segment [Member] | Farmland [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts |  | 1 |
Pre-Modification Recorded Investment |  | $ 400,778 |
Post-Modification Recorded Investment |  | $ 400,778 |
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts |  | 1 |
Pre-Modification Recorded Investment |  | $ 349,976 |
Post-Modification Recorded Investment |  | $ 349,976 |
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts |  |  | 1
Pre-Modification Recorded Investment |  |  | $ 83,748
Post-Modification Recorded Investment |  |  | $ 81,277

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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