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Note 7 - Derivatives and Hedging Activities - Summary of Interest Rate Cap Derivatives (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Interest rate swap |  |
Notional Amount | $ 39,000,000 |
Designated as Hedging Instrument [Member] | Interest rate cap | Cash Flow Hedging [Member] | Other Assets [Member] |  |
Notional Amount | 30,000,000 |
Fair Value - Asset | 458,812 | $ 506,700
Designated as Hedging Instrument [Member] | Maturity Of 2019 | Cash Flow Hedging [Member] | Other Assets [Member] |  |
Notional Amount | 15,000,000 |
Fair Value - Asset | $ 116,775 | 190,085
Designated as Hedging Instrument [Member] | Maturity Of 2019 | Cash Flow Hedging [Member] | Other Assets [Member] | London Interbank Offered Rate (LIBOR) |  |
Derivative, Basis Spread on Variable Rate | 0.93% |
Designated as Hedging Instrument [Member] | Maturity Of 2021 | Cash Flow Hedging [Member] | Other Assets [Member] |  |
Notional Amount | $ 15,000,000 |
Fair Value - Asset | $ 342,037 | $ 316,615
Designated as Hedging Instrument [Member] | Maturity Of 2021 | Cash Flow Hedging [Member] | Other Assets [Member] | London Interbank Offered Rate (LIBOR) |  |
Derivative, Basis Spread on Variable Rate | 1.43% |

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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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