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Stock-based Compensation (Details 1) - Employee Stock Option [Member] - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Schedule Of Share Based Compensation Stock Options Activity [Line Items]
Number of Options, Beginning balance	625,000
Number of Options, Granted	0
Stock Options, Exercised	(2,000)
Stock Options, Forfeited	0
Number of Options, Ending balance	623,000	625,000
Stock Options, Exercisable	304,000
Weighted Average Exercise Price, Beginning balance	$ 2.85
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Exercised	2.81
Weighted Average Exercise Price, Forfeited	0
Weighted Average Exercise Price, Ending balance	2.85	$ 2.85
Grant Date Weighted Average Exercise Price, Exercisable	$ 2.83
Weighted Average Remaining Contractual Life (Years), Balance	4 years 7 days	4 years 3 months
Weighted Average Remaining Contractual Life (Years), Exercisable	3 years 9 months 18 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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 vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Number of share options (or share units) exercised during the current period.

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