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Stock-based Compensation (Details Textual) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 04, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocated Share Based Compensation Expense		$ 57,000	$ 50,000	$ 112,000	$ 100,000	$ 108,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		434,000		434,000
Class of Warrant or Right, Outstanding							100,000
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 2.20
Notes Payable							$ 1,000,000
Class Of Warrant Or Right Exercised					100,000
Noncash Warrants Exercised					50,000
Stock Issued During Period, Shares, Warrants Exercised					25,000
Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance								1,630,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 244,000		$ 244,000
Performance Share Award Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	161,766
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		129,000		129,000

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Number of warrants or rights exercised.

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The number of noncash warrants exercised.

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Number of shares of stock issued as a result of the exercise of warrants.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of warrants or rights outstanding.

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Aggregate number of common shares reserved for future issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Unrecognized cost of unvested share-based compensation awards.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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