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Stock-Based Compensation And Stock Repurchases (Schedule Of Stock Options Outstanding And Exercisable) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity And Stock-Based Compensation [Line Items] |  |  |
Number of Stock Options, Granted | 219,408 |  |
Weighted Average Exercise Price of Options Outstanding, Granted | $ 16.12 |  |
Class A [Member] |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |
Number of Stock Options, Beginning balance | 586,469 | 524,589 |
Number of Stock Options, Granted | 219,408 | 126,840 |
Number of Stock Options, Exercised | (67,500) | (60,000) |
Number of Stock Options, Forfeited | (25,000) | (4,960) |
Number of Stock Options Outstanding, Ending balance | 713,377 | 586,469 | 524,589
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 14.01 | $ 12.50 |
Weighted Average Exercise Price of Options Outstanding, Granted | 16.12 | 16.40 |
Weighted Average Exercise Price of Options Outstanding, Exercised | 13.42 | 6.02 |
Weighted Average Exercise Price of Options Outstanding, Forfeited | 13.42 | 12.08 |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 14.74 | $ 14.01 | $ 12.50
Weighted Average Remaining Years of Contractual Life | 3 years 6 months 11 days | 2 years 10 months 17 days | 3 years 1 month 24 days
Aggregate Intrinsic Value, Beginning balance | $ 1,530,528 | $ 3,054,325 |
Aggregate Intrinsic Value, Exercised | 185,175 | 610,249 |
Aggregate Intrinsic Value, Ending balance | $ 1,993,628 | $ 1,530,528 | $ 3,054,325

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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