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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Description of significant modifications (such as a change in expiration dating, vesting rights, or exercise prices) to an equity-based compensation plan, including the terms of the modifications.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock Option Plans (Details Textual) - $ / shares			12 Months Ended
Stock Option Plans (Details Textual) - $ / shares	Jun. 10, 2011	Jun. 09, 2006	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit (in dollars per share)			$ 0.84
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit (in dollars per share)			$ 6.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			407,566	381,447
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			$ 1.25
Plan 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	250,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			41,719
Plan 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		600,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent		100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Terms			Plan which expire at various dates through November 2024
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			365,847
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			2 years 2 months 12 days	2 years 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price			$ 4.41	$ 4.54	$ 4.39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			396,941	381,447	397,671
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			$ 1.25