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Stock-Based Compensation (Details 1) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Options, Outstanding:
Beginning balance	143,224	216,859	298,740
Issued			3,000
Exercised	(108,201)	(72,535)	(77,144)
Forfeited	(900)		(1,100)
Expired		(1,100)	(6,637)
Ending balance	34,123	143,224	216,859
Options, Outstanding, Weighted Average Exercise Price:
Beginning balance	$ 9.13	$ 8.80	$ 9.97
Issued			49.49
Exercised	7.17	8.19	14.48
Forfeited	34.47		15.48
Expired		5.76	12.87
Ending balance	$ 14.69	$ 9.13	$ 8.80

X

- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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- Definition

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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 of the plan that expired.

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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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