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Note 7 - Derivatives and Hedging Activities - Summary of Interest Rate Cap Derivatives (Details) - Cash Flow Hedging [Member] - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Interest Rate Cap [Member] |  |
National Amount | $ 30,000,000 |
Fair value | 506,700 | $ 576,527
Other Assets [Member] | Interest Rate Cap 1 [Member] |  |
National Amount | 15,000,000 |
Fair value | 190,085 | 179,939
Other Assets [Member] | Interest Rate Cap 2 [Member] |  |
National Amount | 15,000,000 |
Fair value | $ 316,615 | $ 396,588

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Details
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