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Note 4 - Loans - Modified in a Troubled Debt Restructuring (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Number of contracts |  | 2 | 3
Pre-modification |  | $ 446,064 | $ 1,620,213
Post-modification |  | $ 445,881 | $ 1,541,568
Real Estate Portfolio Segment [Member] | Commercial [Member] |  |  |
Number of contracts |  | 1 | 1
Pre-modification |  | $ 91,280 | $ 513,868
Post-modification |  | $ 91,097 | $ 505,978
Real Estate Portfolio Segment [Member] | Residential [Member] |  |  |
Number of contracts |  | 1 | 2
Pre-modification |  | $ 354,784 | $ 1,106,345
Post-modification |  | $ 354,784 | $ 1,035,590

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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=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables 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=84173941&loc=SL6953676-111524 + Details
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