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Equity And Stock-Based Compensation (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Aug. 03, 2016 | Dec. 31, 2014 | May 16, 2014 | May 14, 2004
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grant date fair value of options vesting |  |  | $ 74,000 | $ 75,000 | $ 264,000 | $ 209,000 |  |  |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  | $ 661,000 |  | $ 661,000 |  |  |  |  |  |
Recognition period of unrecognized compensation cost |  |  |  |  | 1 year 11 months 9 days |  |  |  |  |  |
Options exercised |  |  | 0 |  | 0 |  |  |  |  |  |
Intrinsic unrealized value of all options outstanding, vested and expected to vest |  |  | $ 2,100,000 |  | $ 2,100,000 |  |  |  |  |  |
Percentage of option currently exercisable |  |  |  |  | 75.80% |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  | 130,000 |  | $ 290,000 |  |  |  |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  | $ 526,000 |  | $ 526,000 |  |  |  |  |  |
Common Stock shares remaining for future issuances |  |  | 68,153 |  | 68,153 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Employee/Director [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted | 5,625 | 62,528 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  | 4 years |  |  |  |  |  |
Percentage of shares vested |  |  |  |  | 25.00% |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  | 1 year |  |  |  |  |  |
Percentage of shares vested |  |  |  |  | 100.00% |  |  |  |  |  |
May 2014 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase program, amount authorized |  |  |  |  |  |  |  |  |  | $ 10,000,000 |
Repurchase program, shares authorized |  |  |  |  |  |  |  |  |  |  | 350,000
Repurchased program, amount repurchased |  |  |  |  | $ 7,200,000 |  |  |  |  |  |
Repurchase program, remaining amount authorized |  |  | $ 2,800,000 |  | $ 2,800,000 |  |  |  |  |  |
Share price |  |  |  |  | $ 12.92 |  |  |  |  |  |
James Cotter Jr. [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options outstanding |  |  |  |  |  |  |  | 582,000 |  |  |
Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock authorized for issuance under 2010 Stock Incentive Plan |  |  | 1,250,000 |  | 1,250,000 |  |  |  |  |  |
Common Stock shares remaining for future issuances |  |  | 551,800 |  | 551,800 |  |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  |  |  |  |  | 185,000 |  |  |  |
Options granted |  |  |  |  | 169,000 |  | 112,000 |  |  |  |
Stock options terminated |  |  |  |  | 74,000 |  | 8,000 |  |  |  |
Options outstanding |  |  | 582,000 |  | 582,000 |  | 487,000 |  | 568,000 |  |
Class A [Member] | James Cotter Jr. [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock options terminated |  |  |  |  | 50,000 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  | 0 years |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  | 4 years |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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