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Interest Rate Swap (Narrative) (Details) - Palmer of Texas [Member] - Interest Rate Swap [Member] - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Interest rate swap, notional amount | $ 10,500,000 | $ 12,750,000
Term Loan [Member] |  |
Derivative [Line Items] |  |
Interest rate swap asset | $ 127,981 | $ 31,285

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