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Pension and Other Postretirement Plans (Narrative) (Details) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 13, 2017 | Sep. 16, 2016 | Dec. 02, 2015 | Mar. 07, 2014 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Apr. 26, 2018 | Apr. 28, 2011
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  |  |  |  |
Granted and exercisable stock options |  |  |  |  | 183,867 | 107,700 | 183,867 | 107,700 |  |
Shares underlying unexercised options |  |  |  |  | 705,233 | 431,600 | 705,233 | 431,600 |  |
Expected future compensation expense, unexercised options |  |  |  |  | $ 1,200,000 | $ 1,000,000 | $ 1,200,000 | $ 1,000,000 |  |
Expected future compensation expense, weighted average period for recognition |  |  |  |  |  |  | 7 years | 6 years 9 months 18 days |  |
December 2, 2015 And March 7, 2014 [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 10 years |  |  |
2018 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance |  |  |  |  |  |  |  |  | 1,000,000 |
2011 Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance |  |  |  |  |  |  |  |  |  | 900,000
Supplemental Employee Retirement Plan [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Normal retirement age |  |  |  |  |  |  | 65 years |  |  |
Retirement benefit as percentage of compensation |  |  |  |  | 75.00% |  | 75.00% |  |  |
Net periodic pension/postretirement cost (benefit) |  |  |  |  | $ 3,000 | 4,000 | $ 6,000 | $ 8,000 |  |
Pension Plan [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net periodic pension/postretirement cost (benefit) |  |  |  |  | $ (10,000) | $ 9,000 | $ (20,000) | $ 18,000 |  |
Board Of Directors And Executive Officers [Member] | 2011 Stock Plan [Member] | September 13, 2017 [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Options granted | 350,000 |  |  |  |  |  |  |  |  |
Board Of Directors And Executive Officers [Member] | 2011 Stock Plan [Member] | September 16, 2016 [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Options granted |  | 160,000 |  |  |  |  |  |  |  |
Board Of Directors And Executive Officers [Member] | Tranche 1 - 10 [Member] | 2011 Stock Plan [Member] | September 16, 2016 [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage |  | 10.00% |  |  |  |  |  |  |  |
Board Of Directors And Executive Officers [Member] | Tranche 1 - 3 [Member] | 2011 Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage |  | 33.00% |  |  |  |  |  |  |  |
Directors [Member] | 2011 Stock Plan [Member] | December 2, 2015 [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Options granted |  |  | 120,000 |  |  |  |  |  |  |
Directors [Member] | 2011 Stock Plan [Member] | March 7, 2014 [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  | 110,000 |  |  |  |  |  |
Directors [Member] | Tranche 1 - 10 [Member] | 2011 Stock Plan [Member] | September 13, 2017 [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage | 10.00% |  |  |  |  |  |  |  |  |
Directors [Member] | Tranche 1 - 10 [Member] | 2011 Stock Plan [Member] | December 2, 2015 And March 7, 2014 [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  | 10.00% |  |  |
Executive Officers [Member] | Tranche 1 - 5 [Member] | 2011 Stock Plan [Member] | September 13, 2017 [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage | 20.00% |  |  |  |  |  |  |  |  |

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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=96867065&loc=d3e5070-113901 + Details
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